Løs (1/2x-2/3y+3/4)*(1/2x+frac{2}{3}y-frac{3}{4})=

$$( \frac { 1 } { 2 } x - \frac { 2 } { 3 } y + \frac { 3 } { 4 } ) \cdot ( \frac { 1 } { 2 } x + \frac { 2 } { 3 } y - \frac { 3 } { 4 } ) =$$

Evaluer

$$-\frac{\left(8y-9\right)^{2}}{144}+\frac{x^{2}}{4}$$

Løsningsvejledning

Anvend fordelingsegenskaben ved at gange hvert led i \frac{1}{2}x-\frac{2}{3}y+\frac{3}{4} med hvert led i \frac{1}{2}x+\frac{2}{3}y-\frac{3}{4}.

$$\frac{1}{2}x\times \frac{1}{2}x+\frac{1}{2}x\times \frac{2}{3}y+\frac{1}{2}x\left(-\frac{3}{4}\right)-\frac{2}{3}y\times \frac{1}{2}x-\frac{2}{3}y\times \frac{2}{3}y-\frac{2}{3}y\left(-\frac{3}{4}\right)+\frac{3}{4}\times \frac{1}{2}x+\frac{3}{4}\times \frac{2}{3}y+\frac{3}{4}\left(-\frac{3}{4}\right)$$

Multiplicer x og x for at få x^{2}.

$$\frac{1}{2}x^{2}\times \frac{1}{2}+\frac{1}{2}x\times \frac{2}{3}y+\frac{1}{2}x\left(-\frac{3}{4}\right)-\frac{2}{3}y\times \frac{1}{2}x-\frac{2}{3}y\times \frac{2}{3}y-\frac{2}{3}y\left(-\frac{3}{4}\right)+\frac{3}{4}\times \frac{1}{2}x+\frac{3}{4}\times \frac{2}{3}y+\frac{3}{4}\left(-\frac{3}{4}\right)$$

Multiplicer y og y for at få y^{2}.

$$\frac{1}{2}x^{2}\times \frac{1}{2}+\frac{1}{2}x\times \frac{2}{3}y+\frac{1}{2}x\left(-\frac{3}{4}\right)-\frac{2}{3}y\times \frac{1}{2}x-\frac{2}{3}y^{2}\times \frac{2}{3}-\frac{2}{3}y\left(-\frac{3}{4}\right)+\frac{3}{4}\times \frac{1}{2}x+\frac{3}{4}\times \frac{2}{3}y+\frac{3}{4}\left(-\frac{3}{4}\right)$$

Multiplicer \frac{1}{2} gange \frac{1}{2} ved at multiplicere tæller gange tæller og nævner gange nævner.

$$\frac{1\times 1}{2\times 2}x^{2}+\frac{1}{2}x\times \frac{2}{3}y+\frac{1}{2}x\left(-\frac{3}{4}\right)-\frac{2}{3}y\times \frac{1}{2}x-\frac{2}{3}y^{2}\times \frac{2}{3}-\frac{2}{3}y\left(-\frac{3}{4}\right)+\frac{3}{4}\times \frac{1}{2}x+\frac{3}{4}\times \frac{2}{3}y+\frac{3}{4}\left(-\frac{3}{4}\right)$$

Udfør multiplicationerne i fraktionen \frac{1\times 1}{2\times 2}.

$$\frac{1}{4}x^{2}+\frac{1}{2}x\times \frac{2}{3}y+\frac{1}{2}x\left(-\frac{3}{4}\right)-\frac{2}{3}y\times \frac{1}{2}x-\frac{2}{3}y^{2}\times \frac{2}{3}-\frac{2}{3}y\left(-\frac{3}{4}\right)+\frac{3}{4}\times \frac{1}{2}x+\frac{3}{4}\times \frac{2}{3}y+\frac{3}{4}\left(-\frac{3}{4}\right)$$

Multiplicer \frac{1}{2} gange \frac{2}{3} ved at multiplicere tæller gange tæller og nævner gange nævner.

$$\frac{1}{4}x^{2}+\frac{1\times 2}{2\times 3}xy+\frac{1}{2}x\left(-\frac{3}{4}\right)-\frac{2}{3}y\times \frac{1}{2}x-\frac{2}{3}y^{2}\times \frac{2}{3}-\frac{2}{3}y\left(-\frac{3}{4}\right)+\frac{3}{4}\times \frac{1}{2}x+\frac{3}{4}\times \frac{2}{3}y+\frac{3}{4}\left(-\frac{3}{4}\right)$$

Udlign 2 i både tælleren og nævneren.

$$\frac{1}{4}x^{2}+\frac{1}{3}xy+\frac{1}{2}x\left(-\frac{3}{4}\right)-\frac{2}{3}y\times \frac{1}{2}x-\frac{2}{3}y^{2}\times \frac{2}{3}-\frac{2}{3}y\left(-\frac{3}{4}\right)+\frac{3}{4}\times \frac{1}{2}x+\frac{3}{4}\times \frac{2}{3}y+\frac{3}{4}\left(-\frac{3}{4}\right)$$

Multiplicer \frac{1}{2} gange -\frac{3}{4} ved at multiplicere tæller gange tæller og nævner gange nævner.

$$\frac{1}{4}x^{2}+\frac{1}{3}xy+\frac{1\left(-3\right)}{2\times 4}x-\frac{2}{3}y\times \frac{1}{2}x-\frac{2}{3}y^{2}\times \frac{2}{3}-\frac{2}{3}y\left(-\frac{3}{4}\right)+\frac{3}{4}\times \frac{1}{2}x+\frac{3}{4}\times \frac{2}{3}y+\frac{3}{4}\left(-\frac{3}{4}\right)$$

Udfør multiplicationerne i fraktionen \frac{1\left(-3\right)}{2\times 4}.

$$\frac{1}{4}x^{2}+\frac{1}{3}xy+\frac{-3}{8}x-\frac{2}{3}y\times \frac{1}{2}x-\frac{2}{3}y^{2}\times \frac{2}{3}-\frac{2}{3}y\left(-\frac{3}{4}\right)+\frac{3}{4}\times \frac{1}{2}x+\frac{3}{4}\times \frac{2}{3}y+\frac{3}{4}\left(-\frac{3}{4}\right)$$

Brøken \frac{-3}{8} kan omskrives som -\frac{3}{8} ved at fratrække det negative fortegn.

$$\frac{1}{4}x^{2}+\frac{1}{3}xy-\frac{3}{8}x-\frac{2}{3}y\times \frac{1}{2}x-\frac{2}{3}y^{2}\times \frac{2}{3}-\frac{2}{3}y\left(-\frac{3}{4}\right)+\frac{3}{4}\times \frac{1}{2}x+\frac{3}{4}\times \frac{2}{3}y+\frac{3}{4}\left(-\frac{3}{4}\right)$$

Multiplicer -\frac{2}{3} gange \frac{1}{2} ved at multiplicere tæller gange tæller og nævner gange nævner.

$$\frac{1}{4}x^{2}+\frac{1}{3}xy-\frac{3}{8}x+\frac{-2}{3\times 2}yx-\frac{2}{3}y^{2}\times \frac{2}{3}-\frac{2}{3}y\left(-\frac{3}{4}\right)+\frac{3}{4}\times \frac{1}{2}x+\frac{3}{4}\times \frac{2}{3}y+\frac{3}{4}\left(-\frac{3}{4}\right)$$

Udfør multiplicationerne i fraktionen \frac{-2}{3\times 2}.

$$\frac{1}{4}x^{2}+\frac{1}{3}xy-\frac{3}{8}x+\frac{-2}{6}yx-\frac{2}{3}y^{2}\times \frac{2}{3}-\frac{2}{3}y\left(-\frac{3}{4}\right)+\frac{3}{4}\times \frac{1}{2}x+\frac{3}{4}\times \frac{2}{3}y+\frac{3}{4}\left(-\frac{3}{4}\right)$$

Reducer fraktionen \frac{-2}{6} til de laveste led ved at udtrække og annullere 2.

$$\frac{1}{4}x^{2}+\frac{1}{3}xy-\frac{3}{8}x-\frac{1}{3}yx-\frac{2}{3}y^{2}\times \frac{2}{3}-\frac{2}{3}y\left(-\frac{3}{4}\right)+\frac{3}{4}\times \frac{1}{2}x+\frac{3}{4}\times \frac{2}{3}y+\frac{3}{4}\left(-\frac{3}{4}\right)$$

Kombiner \frac{1}{3}xy og -\frac{1}{3}yx for at få 0.

$$\frac{1}{4}x^{2}-\frac{3}{8}x-\frac{2}{3}y^{2}\times \frac{2}{3}-\frac{2}{3}y\left(-\frac{3}{4}\right)+\frac{3}{4}\times \frac{1}{2}x+\frac{3}{4}\times \frac{2}{3}y+\frac{3}{4}\left(-\frac{3}{4}\right)$$

Multiplicer -\frac{2}{3} gange \frac{2}{3} ved at multiplicere tæller gange tæller og nævner gange nævner.

$$\frac{1}{4}x^{2}-\frac{3}{8}x+\frac{-2\times 2}{3\times 3}y^{2}-\frac{2}{3}y\left(-\frac{3}{4}\right)+\frac{3}{4}\times \frac{1}{2}x+\frac{3}{4}\times \frac{2}{3}y+\frac{3}{4}\left(-\frac{3}{4}\right)$$

Udfør multiplicationerne i fraktionen \frac{-2\times 2}{3\times 3}.

$$\frac{1}{4}x^{2}-\frac{3}{8}x+\frac{-4}{9}y^{2}-\frac{2}{3}y\left(-\frac{3}{4}\right)+\frac{3}{4}\times \frac{1}{2}x+\frac{3}{4}\times \frac{2}{3}y+\frac{3}{4}\left(-\frac{3}{4}\right)$$

Brøken \frac{-4}{9} kan omskrives som -\frac{4}{9} ved at fratrække det negative fortegn.

$$\frac{1}{4}x^{2}-\frac{3}{8}x-\frac{4}{9}y^{2}-\frac{2}{3}y\left(-\frac{3}{4}\right)+\frac{3}{4}\times \frac{1}{2}x+\frac{3}{4}\times \frac{2}{3}y+\frac{3}{4}\left(-\frac{3}{4}\right)$$

Multiplicer -\frac{2}{3} gange -\frac{3}{4} ved at multiplicere tæller gange tæller og nævner gange nævner.

$$\frac{1}{4}x^{2}-\frac{3}{8}x-\frac{4}{9}y^{2}+\frac{-2\left(-3\right)}{3\times 4}y+\frac{3}{4}\times \frac{1}{2}x+\frac{3}{4}\times \frac{2}{3}y+\frac{3}{4}\left(-\frac{3}{4}\right)$$

Udfør multiplicationerne i fraktionen \frac{-2\left(-3\right)}{3\times 4}.

$$\frac{1}{4}x^{2}-\frac{3}{8}x-\frac{4}{9}y^{2}+\frac{6}{12}y+\frac{3}{4}\times \frac{1}{2}x+\frac{3}{4}\times \frac{2}{3}y+\frac{3}{4}\left(-\frac{3}{4}\right)$$

Reducer fraktionen \frac{6}{12} til de laveste led ved at udtrække og annullere 6.

$$\frac{1}{4}x^{2}-\frac{3}{8}x-\frac{4}{9}y^{2}+\frac{1}{2}y+\frac{3}{4}\times \frac{1}{2}x+\frac{3}{4}\times \frac{2}{3}y+\frac{3}{4}\left(-\frac{3}{4}\right)$$

Multiplicer \frac{3}{4} gange \frac{1}{2} ved at multiplicere tæller gange tæller og nævner gange nævner.

$$\frac{1}{4}x^{2}-\frac{3}{8}x-\frac{4}{9}y^{2}+\frac{1}{2}y+\frac{3\times 1}{4\times 2}x+\frac{3}{4}\times \frac{2}{3}y+\frac{3}{4}\left(-\frac{3}{4}\right)$$

Udfør multiplicationerne i fraktionen \frac{3\times 1}{4\times 2}.

$$\frac{1}{4}x^{2}-\frac{3}{8}x-\frac{4}{9}y^{2}+\frac{1}{2}y+\frac{3}{8}x+\frac{3}{4}\times \frac{2}{3}y+\frac{3}{4}\left(-\frac{3}{4}\right)$$

Kombiner -\frac{3}{8}x og \frac{3}{8}x for at få 0.

$$\frac{1}{4}x^{2}-\frac{4}{9}y^{2}+\frac{1}{2}y+\frac{3}{4}\times \frac{2}{3}y+\frac{3}{4}\left(-\frac{3}{4}\right)$$

Multiplicer \frac{3}{4} gange \frac{2}{3} ved at multiplicere tæller gange tæller og nævner gange nævner.

$$\frac{1}{4}x^{2}-\frac{4}{9}y^{2}+\frac{1}{2}y+\frac{3\times 2}{4\times 3}y+\frac{3}{4}\left(-\frac{3}{4}\right)$$

Udlign 3 i både tælleren og nævneren.

$$\frac{1}{4}x^{2}-\frac{4}{9}y^{2}+\frac{1}{2}y+\frac{2}{4}y+\frac{3}{4}\left(-\frac{3}{4}\right)$$

Reducer fraktionen \frac{2}{4} til de laveste led ved at udtrække og annullere 2.

$$\frac{1}{4}x^{2}-\frac{4}{9}y^{2}+\frac{1}{2}y+\frac{1}{2}y+\frac{3}{4}\left(-\frac{3}{4}\right)$$

Kombiner \frac{1}{2}y og \frac{1}{2}y for at få y.

$$\frac{1}{4}x^{2}-\frac{4}{9}y^{2}+y+\frac{3}{4}\left(-\frac{3}{4}\right)$$

Multiplicer \frac{3}{4} gange -\frac{3}{4} ved at multiplicere tæller gange tæller og nævner gange nævner.

$$\frac{1}{4}x^{2}-\frac{4}{9}y^{2}+y+\frac{3\left(-3\right)}{4\times 4}$$

Udfør multiplicationerne i fraktionen \frac{3\left(-3\right)}{4\times 4}.

$$\frac{1}{4}x^{2}-\frac{4}{9}y^{2}+y+\frac{-9}{16}$$

Brøken \frac{-9}{16} kan omskrives som -\frac{9}{16} ved at fratrække det negative fortegn.

$$\frac{1}{4}x^{2}-\frac{4}{9}y^{2}+y-\frac{9}{16}$$

Udvid

$$\frac{x^{2}}{4}-\frac{4y^{2}}{9}+y-\frac{9}{16}$$

Løsningsvejledning

Anvend fordelingsegenskaben ved at gange hvert led i \frac{1}{2}x-\frac{2}{3}y+\frac{3}{4} med hvert led i \frac{1}{2}x+\frac{2}{3}y-\frac{3}{4}.

$$\frac{1}{2}x\times \frac{1}{2}x+\frac{1}{2}x\times \frac{2}{3}y+\frac{1}{2}x\left(-\frac{3}{4}\right)-\frac{2}{3}y\times \frac{1}{2}x-\frac{2}{3}y\times \frac{2}{3}y-\frac{2}{3}y\left(-\frac{3}{4}\right)+\frac{3}{4}\times \frac{1}{2}x+\frac{3}{4}\times \frac{2}{3}y+\frac{3}{4}\left(-\frac{3}{4}\right)$$

Multiplicer x og x for at få x^{2}.

$$\frac{1}{2}x^{2}\times \frac{1}{2}+\frac{1}{2}x\times \frac{2}{3}y+\frac{1}{2}x\left(-\frac{3}{4}\right)-\frac{2}{3}y\times \frac{1}{2}x-\frac{2}{3}y\times \frac{2}{3}y-\frac{2}{3}y\left(-\frac{3}{4}\right)+\frac{3}{4}\times \frac{1}{2}x+\frac{3}{4}\times \frac{2}{3}y+\frac{3}{4}\left(-\frac{3}{4}\right)$$

Multiplicer y og y for at få y^{2}.

$$\frac{1}{2}x^{2}\times \frac{1}{2}+\frac{1}{2}x\times \frac{2}{3}y+\frac{1}{2}x\left(-\frac{3}{4}\right)-\frac{2}{3}y\times \frac{1}{2}x-\frac{2}{3}y^{2}\times \frac{2}{3}-\frac{2}{3}y\left(-\frac{3}{4}\right)+\frac{3}{4}\times \frac{1}{2}x+\frac{3}{4}\times \frac{2}{3}y+\frac{3}{4}\left(-\frac{3}{4}\right)$$

Multiplicer \frac{1}{2} gange \frac{1}{2} ved at multiplicere tæller gange tæller og nævner gange nævner.

$$\frac{1\times 1}{2\times 2}x^{2}+\frac{1}{2}x\times \frac{2}{3}y+\frac{1}{2}x\left(-\frac{3}{4}\right)-\frac{2}{3}y\times \frac{1}{2}x-\frac{2}{3}y^{2}\times \frac{2}{3}-\frac{2}{3}y\left(-\frac{3}{4}\right)+\frac{3}{4}\times \frac{1}{2}x+\frac{3}{4}\times \frac{2}{3}y+\frac{3}{4}\left(-\frac{3}{4}\right)$$

Udfør multiplicationerne i fraktionen \frac{1\times 1}{2\times 2}.

$$\frac{1}{4}x^{2}+\frac{1}{2}x\times \frac{2}{3}y+\frac{1}{2}x\left(-\frac{3}{4}\right)-\frac{2}{3}y\times \frac{1}{2}x-\frac{2}{3}y^{2}\times \frac{2}{3}-\frac{2}{3}y\left(-\frac{3}{4}\right)+\frac{3}{4}\times \frac{1}{2}x+\frac{3}{4}\times \frac{2}{3}y+\frac{3}{4}\left(-\frac{3}{4}\right)$$

Multiplicer \frac{1}{2} gange \frac{2}{3} ved at multiplicere tæller gange tæller og nævner gange nævner.

$$\frac{1}{4}x^{2}+\frac{1\times 2}{2\times 3}xy+\frac{1}{2}x\left(-\frac{3}{4}\right)-\frac{2}{3}y\times \frac{1}{2}x-\frac{2}{3}y^{2}\times \frac{2}{3}-\frac{2}{3}y\left(-\frac{3}{4}\right)+\frac{3}{4}\times \frac{1}{2}x+\frac{3}{4}\times \frac{2}{3}y+\frac{3}{4}\left(-\frac{3}{4}\right)$$

Udlign 2 i både tælleren og nævneren.

$$\frac{1}{4}x^{2}+\frac{1}{3}xy+\frac{1}{2}x\left(-\frac{3}{4}\right)-\frac{2}{3}y\times \frac{1}{2}x-\frac{2}{3}y^{2}\times \frac{2}{3}-\frac{2}{3}y\left(-\frac{3}{4}\right)+\frac{3}{4}\times \frac{1}{2}x+\frac{3}{4}\times \frac{2}{3}y+\frac{3}{4}\left(-\frac{3}{4}\right)$$

Multiplicer \frac{1}{2} gange -\frac{3}{4} ved at multiplicere tæller gange tæller og nævner gange nævner.

$$\frac{1}{4}x^{2}+\frac{1}{3}xy+\frac{1\left(-3\right)}{2\times 4}x-\frac{2}{3}y\times \frac{1}{2}x-\frac{2}{3}y^{2}\times \frac{2}{3}-\frac{2}{3}y\left(-\frac{3}{4}\right)+\frac{3}{4}\times \frac{1}{2}x+\frac{3}{4}\times \frac{2}{3}y+\frac{3}{4}\left(-\frac{3}{4}\right)$$

Udfør multiplicationerne i fraktionen \frac{1\left(-3\right)}{2\times 4}.

$$\frac{1}{4}x^{2}+\frac{1}{3}xy+\frac{-3}{8}x-\frac{2}{3}y\times \frac{1}{2}x-\frac{2}{3}y^{2}\times \frac{2}{3}-\frac{2}{3}y\left(-\frac{3}{4}\right)+\frac{3}{4}\times \frac{1}{2}x+\frac{3}{4}\times \frac{2}{3}y+\frac{3}{4}\left(-\frac{3}{4}\right)$$

Brøken \frac{-3}{8} kan omskrives som -\frac{3}{8} ved at fratrække det negative fortegn.

$$\frac{1}{4}x^{2}+\frac{1}{3}xy-\frac{3}{8}x-\frac{2}{3}y\times \frac{1}{2}x-\frac{2}{3}y^{2}\times \frac{2}{3}-\frac{2}{3}y\left(-\frac{3}{4}\right)+\frac{3}{4}\times \frac{1}{2}x+\frac{3}{4}\times \frac{2}{3}y+\frac{3}{4}\left(-\frac{3}{4}\right)$$

Multiplicer -\frac{2}{3} gange \frac{1}{2} ved at multiplicere tæller gange tæller og nævner gange nævner.

$$\frac{1}{4}x^{2}+\frac{1}{3}xy-\frac{3}{8}x+\frac{-2}{3\times 2}yx-\frac{2}{3}y^{2}\times \frac{2}{3}-\frac{2}{3}y\left(-\frac{3}{4}\right)+\frac{3}{4}\times \frac{1}{2}x+\frac{3}{4}\times \frac{2}{3}y+\frac{3}{4}\left(-\frac{3}{4}\right)$$

Udfør multiplicationerne i fraktionen \frac{-2}{3\times 2}.

$$\frac{1}{4}x^{2}+\frac{1}{3}xy-\frac{3}{8}x+\frac{-2}{6}yx-\frac{2}{3}y^{2}\times \frac{2}{3}-\frac{2}{3}y\left(-\frac{3}{4}\right)+\frac{3}{4}\times \frac{1}{2}x+\frac{3}{4}\times \frac{2}{3}y+\frac{3}{4}\left(-\frac{3}{4}\right)$$

Reducer fraktionen \frac{-2}{6} til de laveste led ved at udtrække og annullere 2.

$$\frac{1}{4}x^{2}+\frac{1}{3}xy-\frac{3}{8}x-\frac{1}{3}yx-\frac{2}{3}y^{2}\times \frac{2}{3}-\frac{2}{3}y\left(-\frac{3}{4}\right)+\frac{3}{4}\times \frac{1}{2}x+\frac{3}{4}\times \frac{2}{3}y+\frac{3}{4}\left(-\frac{3}{4}\right)$$

Kombiner \frac{1}{3}xy og -\frac{1}{3}yx for at få 0.

$$\frac{1}{4}x^{2}-\frac{3}{8}x-\frac{2}{3}y^{2}\times \frac{2}{3}-\frac{2}{3}y\left(-\frac{3}{4}\right)+\frac{3}{4}\times \frac{1}{2}x+\frac{3}{4}\times \frac{2}{3}y+\frac{3}{4}\left(-\frac{3}{4}\right)$$

Multiplicer -\frac{2}{3} gange \frac{2}{3} ved at multiplicere tæller gange tæller og nævner gange nævner.

$$\frac{1}{4}x^{2}-\frac{3}{8}x+\frac{-2\times 2}{3\times 3}y^{2}-\frac{2}{3}y\left(-\frac{3}{4}\right)+\frac{3}{4}\times \frac{1}{2}x+\frac{3}{4}\times \frac{2}{3}y+\frac{3}{4}\left(-\frac{3}{4}\right)$$

Udfør multiplicationerne i fraktionen \frac{-2\times 2}{3\times 3}.

$$\frac{1}{4}x^{2}-\frac{3}{8}x+\frac{-4}{9}y^{2}-\frac{2}{3}y\left(-\frac{3}{4}\right)+\frac{3}{4}\times \frac{1}{2}x+\frac{3}{4}\times \frac{2}{3}y+\frac{3}{4}\left(-\frac{3}{4}\right)$$

Brøken \frac{-4}{9} kan omskrives som -\frac{4}{9} ved at fratrække det negative fortegn.

$$\frac{1}{4}x^{2}-\frac{3}{8}x-\frac{4}{9}y^{2}-\frac{2}{3}y\left(-\frac{3}{4}\right)+\frac{3}{4}\times \frac{1}{2}x+\frac{3}{4}\times \frac{2}{3}y+\frac{3}{4}\left(-\frac{3}{4}\right)$$

Multiplicer -\frac{2}{3} gange -\frac{3}{4} ved at multiplicere tæller gange tæller og nævner gange nævner.

$$\frac{1}{4}x^{2}-\frac{3}{8}x-\frac{4}{9}y^{2}+\frac{-2\left(-3\right)}{3\times 4}y+\frac{3}{4}\times \frac{1}{2}x+\frac{3}{4}\times \frac{2}{3}y+\frac{3}{4}\left(-\frac{3}{4}\right)$$

Udfør multiplicationerne i fraktionen \frac{-2\left(-3\right)}{3\times 4}.

$$\frac{1}{4}x^{2}-\frac{3}{8}x-\frac{4}{9}y^{2}+\frac{6}{12}y+\frac{3}{4}\times \frac{1}{2}x+\frac{3}{4}\times \frac{2}{3}y+\frac{3}{4}\left(-\frac{3}{4}\right)$$

Reducer fraktionen \frac{6}{12} til de laveste led ved at udtrække og annullere 6.

$$\frac{1}{4}x^{2}-\frac{3}{8}x-\frac{4}{9}y^{2}+\frac{1}{2}y+\frac{3}{4}\times \frac{1}{2}x+\frac{3}{4}\times \frac{2}{3}y+\frac{3}{4}\left(-\frac{3}{4}\right)$$

Multiplicer \frac{3}{4} gange \frac{1}{2} ved at multiplicere tæller gange tæller og nævner gange nævner.

$$\frac{1}{4}x^{2}-\frac{3}{8}x-\frac{4}{9}y^{2}+\frac{1}{2}y+\frac{3\times 1}{4\times 2}x+\frac{3}{4}\times \frac{2}{3}y+\frac{3}{4}\left(-\frac{3}{4}\right)$$

Udfør multiplicationerne i fraktionen \frac{3\times 1}{4\times 2}.

$$\frac{1}{4}x^{2}-\frac{3}{8}x-\frac{4}{9}y^{2}+\frac{1}{2}y+\frac{3}{8}x+\frac{3}{4}\times \frac{2}{3}y+\frac{3}{4}\left(-\frac{3}{4}\right)$$

Kombiner -\frac{3}{8}x og \frac{3}{8}x for at få 0.

$$\frac{1}{4}x^{2}-\frac{4}{9}y^{2}+\frac{1}{2}y+\frac{3}{4}\times \frac{2}{3}y+\frac{3}{4}\left(-\frac{3}{4}\right)$$

Multiplicer \frac{3}{4} gange \frac{2}{3} ved at multiplicere tæller gange tæller og nævner gange nævner.

$$\frac{1}{4}x^{2}-\frac{4}{9}y^{2}+\frac{1}{2}y+\frac{3\times 2}{4\times 3}y+\frac{3}{4}\left(-\frac{3}{4}\right)$$

Udlign 3 i både tælleren og nævneren.

$$\frac{1}{4}x^{2}-\frac{4}{9}y^{2}+\frac{1}{2}y+\frac{2}{4}y+\frac{3}{4}\left(-\frac{3}{4}\right)$$

Reducer fraktionen \frac{2}{4} til de laveste led ved at udtrække og annullere 2.

$$\frac{1}{4}x^{2}-\frac{4}{9}y^{2}+\frac{1}{2}y+\frac{1}{2}y+\frac{3}{4}\left(-\frac{3}{4}\right)$$

Kombiner \frac{1}{2}y og \frac{1}{2}y for at få y.

$$\frac{1}{4}x^{2}-\frac{4}{9}y^{2}+y+\frac{3}{4}\left(-\frac{3}{4}\right)$$

Multiplicer \frac{3}{4} gange -\frac{3}{4} ved at multiplicere tæller gange tæller og nævner gange nævner.

$$\frac{1}{4}x^{2}-\frac{4}{9}y^{2}+y+\frac{3\left(-3\right)}{4\times 4}$$

Udfør multiplicationerne i fraktionen \frac{3\left(-3\right)}{4\times 4}.

$$\frac{1}{4}x^{2}-\frac{4}{9}y^{2}+y+\frac{-9}{16}$$

Brøken \frac{-9}{16} kan omskrives som -\frac{9}{16} ved at fratrække det negative fortegn.

$$\frac{1}{4}x^{2}-\frac{4}{9}y^{2}+y-\frac{9}{16}$$