Whakaoti i te 21/2*(3.25-4)-18.21div(-3)

$$2 \frac { 1 } { 2 } \times ( 3.25 - 4 ) - 18.21 \div ( - 3 )$$

Aromātai

$$4.195$$

Ngā Upane Otinga

Whakareatia te 2 ki te 2, ka 4.

$$\frac{4+1}{2}\left(3.25-4\right)-\frac{18.21}{-3}$$

Tāpirihia te 4 ki te 1, ka 5.

$$\frac{5}{2}\left(3.25-4\right)-\frac{18.21}{-3}$$

Tangohia te 4 i te 3.25, ka -0.75.

$$\frac{5}{2}\left(-0.75\right)-\frac{18.21}{-3}$$

Me tahuri ki tau ā-ira -0.75 ki te hautau -\frac{75}{100}. Whakahekea te hautanga -\frac{75}{100} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te 25.

$$\frac{5}{2}\left(-\frac{3}{4}\right)-\frac{18.21}{-3}$$

Me whakarea te \frac{5}{2} ki te -\frac{3}{4} mā te whakarea taurunga ki te taurunga me te tauraro ki te tauraro.

$$\frac{5\left(-3\right)}{2\times 4}-\frac{18.21}{-3}$$

Mahia ngā whakarea i roto i te hautanga \frac{5\left(-3\right)}{2\times 4}.

$$\frac{-15}{8}-\frac{18.21}{-3}$$

Ka taea te hautanga \frac{-15}{8} te tuhi anō ko -\frac{15}{8} mā te tango i te tohu tōraro.

$$-\frac{15}{8}-\frac{18.21}{-3}$$

Whakarohaina te \frac{18.21}{-3} mā te whakarea i te taurunga me te tauraro ki te 100.

$$-\frac{15}{8}-\frac{1821}{-300}$$

Whakahekea te hautanga \frac{1821}{-300} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te 3.

$$-\frac{15}{8}-\left(-\frac{607}{100}\right)$$

Ko te tauaro o -\frac{607}{100} ko \frac{607}{100}.

$$-\frac{15}{8}+\frac{607}{100}$$

Ko te maha noa iti rawa atu o 8 me 100 ko 200. Me tahuri -\frac{15}{8} me \frac{607}{100} ki te hautau me te tautūnga 200.

$$-\frac{375}{200}+\frac{1214}{200}$$

Tā te mea he rite te tauraro o -\frac{375}{200} me \frac{1214}{200}, me tāpiri rāua mā te tāpiri i ō raua taurunga.

$$\frac{-375+1214}{200}$$

Tāpirihia te -375 ki te 1214, ka 839.

$$\frac{839}{200}$$

Tauwehe

$$\frac{839}{2 ^ {3} \cdot 5 ^ {2}} = 4\frac{39}{200} = 4.195$$