Whakaoti i te (a^{2}+1/2ab-2/5b^{2})-(b^2-3/7a^2+2ab)+(7/5b^2+frac{3}{2}ab-frac{10}{7}a^2)=

$$( a ^ { 2 } + \frac { 1 } { 2 } a b - \frac { 2 } { 5 } b ^ { 2 } ) - ( b ^ { 2 } - \frac { 3 } { 7 } a ^ { 2 } + 2 a b ) + ( \frac { 7 } { 5 } b ^ { 2 } + \frac { 3 } { 2 } a b - \frac { 10 } { 7 } a ^ { 2 } ) =$$

Aromātai

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Ngā Upane Otinga

Hei kimi i te tauaro o b^{2}-\frac{3}{7}a^{2}+2ab, kimihia te tauaro o ia taurangi.

$$a^{2}+\frac{1}{2}ab-\frac{2}{5}b^{2}-b^{2}+\frac{3}{7}a^{2}-2ab+\frac{7}{5}b^{2}+\frac{3}{2}ab-\frac{10}{7}a^{2}$$

Pahekotia te -\frac{2}{5}b^{2} me -b^{2}, ka -\frac{7}{5}b^{2}.

$$a^{2}+\frac{1}{2}ab-\frac{7}{5}b^{2}+\frac{3}{7}a^{2}-2ab+\frac{7}{5}b^{2}+\frac{3}{2}ab-\frac{10}{7}a^{2}$$

Pahekotia te a^{2} me \frac{3}{7}a^{2}, ka \frac{10}{7}a^{2}.

$$\frac{10}{7}a^{2}+\frac{1}{2}ab-\frac{7}{5}b^{2}-2ab+\frac{7}{5}b^{2}+\frac{3}{2}ab-\frac{10}{7}a^{2}$$

Pahekotia te \frac{1}{2}ab me -2ab, ka -\frac{3}{2}ab.

$$\frac{10}{7}a^{2}-\frac{3}{2}ab-\frac{7}{5}b^{2}+\frac{7}{5}b^{2}+\frac{3}{2}ab-\frac{10}{7}a^{2}$$

Pahekotia te -\frac{7}{5}b^{2} me \frac{7}{5}b^{2}, ka 0.

$$\frac{10}{7}a^{2}-\frac{3}{2}ab+\frac{3}{2}ab-\frac{10}{7}a^{2}$$

Pahekotia te -\frac{3}{2}ab me \frac{3}{2}ab, ka 0.

$$\frac{10}{7}a^{2}-\frac{10}{7}a^{2}$$

Pahekotia te \frac{10}{7}a^{2} me -\frac{10}{7}a^{2}, ka 0.

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Tauwehe

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Ngā Upane Otinga

Tauwehea te \frac{1}{70}.

$$\frac{70a^{2}+35ab-28b^{2}-10\left(7b^{2}-3a^{2}+14ab\right)+98b^{2}+105ab-100a^{2}}{70}$$

Whakarūnātia.

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