Whakaoti i te -9/40*2^2+9/10*2

$$- \frac{ 9 }{ 40 } \times { 2 }^{ 2 } + \frac{ 9 }{ 10 } \times 2$$

Aromātai

$$\frac{9}{10}=0.9$$

Ngā Upane Otinga

Tātaihia te 2 mā te pū o 2, kia riro ko 4.

$$-\frac{9}{40}\times 4+\frac{9}{10}\times 2$$

Tuhia te -\frac{9}{40}\times 4 hei hautanga kotahi.

$$\frac{-9\times 4}{40}+\frac{9}{10}\times 2$$

Whakareatia te -9 ki te 4, ka -36.

$$\frac{-36}{40}+\frac{9}{10}\times 2$$

Whakahekea te hautanga \frac{-36}{40} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te 4.

$$-\frac{9}{10}+\frac{9}{10}\times 2$$

Tuhia te \frac{9}{10}\times 2 hei hautanga kotahi.

$$-\frac{9}{10}+\frac{9\times 2}{10}$$

Whakareatia te 9 ki te 2, ka 18.

$$-\frac{9}{10}+\frac{18}{10}$$

Tā te mea he rite te tauraro o -\frac{9}{10} me \frac{18}{10}, me tāpiri rāua mā te tāpiri i ō raua taurunga.

$$\frac{-9+18}{10}$$

Tāpirihia te -9 ki te 18, ka 9.

$$\frac{9}{10}$$

Tauwehe

$$\frac{3 ^ {2}}{2 \cdot 5} = 0.9$$