Whakaoti i te -1/4*8/6-7/18*9/21

$$- \frac{ 1 }{ 4 } \times \frac{ 8 }{ 6 } - \frac{ 7 }{ 18 } \times \frac{ 9 }{ 21 }$$

Aromātai

$$-\frac{1}{2}=-0.5$$

Ngā Upane Otinga

Whakahekea te hautanga \frac{8}{6} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te 2.

$$-\frac{1}{4}\times \frac{4}{3}-\frac{7}{18}\times \frac{9}{21}$$

Me whakarea te -\frac{1}{4} ki te \frac{4}{3} mā te whakarea taurunga ki te taurunga me te tauraro ki te tauraro.

$$\frac{-4}{4\times 3}-\frac{7}{18}\times \frac{9}{21}$$

Me whakakore tahi te 4 i te taurunga me te tauraro.

$$\frac{-1}{3}-\frac{7}{18}\times \frac{9}{21}$$

Ka taea te hautanga \frac{-1}{3} te tuhi anō ko -\frac{1}{3} mā te tango i te tohu tōraro.

$$-\frac{1}{3}-\frac{7}{18}\times \frac{9}{21}$$

Whakahekea te hautanga \frac{9}{21} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te 3.

$$-\frac{1}{3}-\frac{7}{18}\times \frac{3}{7}$$

Me whakarea te \frac{7}{18} ki te \frac{3}{7} mā te whakarea taurunga ki te taurunga me te tauraro ki te tauraro.

$$-\frac{1}{3}-\frac{7\times 3}{18\times 7}$$

Me whakakore tahi te 7 i te taurunga me te tauraro.

$$-\frac{1}{3}-\frac{3}{18}$$

Whakahekea te hautanga \frac{3}{18} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te 3.

$$-\frac{1}{3}-\frac{1}{6}$$

Ko te maha noa iti rawa atu o 3 me 6 ko 6. Me tahuri -\frac{1}{3} me \frac{1}{6} ki te hautau me te tautūnga 6.

$$-\frac{2}{6}-\frac{1}{6}$$

Tā te mea he rite te tauraro o -\frac{2}{6} me \frac{1}{6}, me tango rāua mā te tango i ō raua taurunga.

$$\frac{-2-1}{6}$$

Tangohia te 1 i te -2, ka -3.

$$\frac{-3}{6}$$

Whakahekea te hautanga \frac{-3}{6} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te 3.

$$-\frac{1}{2}$$

Tauwehe

$$-\frac{1}{2} = -0.5$$