①2 xˆ3-xˆ2=②3 aˆ2b+6a bˆ2=③(x+y)ˆ2-3(x+y)=④3x(x-y)+2x(y-x)-y(x-y)=⑤mˆ2n(m-n)ˆ2-2mn(n-m)ˆ3=⑥2aˆ2-4a=⑦(x+3)ˆ2-(x+3)=⑧(3a-4b)(7a-8b)+(11a-12b)(8b-7a)=⑨x(b+c-d)-y(d-b-c)-c-b+d=
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![①2 xˆ3-xˆ2=②3 aˆ2b+6a bˆ2=③(x+y)ˆ2-3(x+y)=④3x(x-y)+2x(y-x)-y(x-y)=⑤mˆ2n(m-n)ˆ2-2mn(n-m)ˆ3=⑥2aˆ2-4a=⑦(x+3)ˆ2-(x+3)=⑧(3a-4b)(7a-8b)+(11a-12b)(8b-7a)=⑨x(b+c-d)-y(d-b-c)-c-b+d=](/uploads/image/z/15030414-54-4.jpg?t=%E2%91%A02+x%26%23710%3B3-x%26%23710%3B2%3D%E2%91%A13+a%26%23710%3B2b%2B6a+b%26%23710%3B2%3D%E2%91%A2%28x%2By%29%26%23710%3B2-3%28x%2By%29%3D%E2%91%A33x%28x-y%29%2B2x%28y-x%29-y%28x-y%29%3D%E2%91%A4m%26%23710%3B2n%28m-n%29%26%23710%3B2-2mn%28n-m%29%26%23710%3B3%3D%E2%91%A52a%26%23710%3B2-4a%3D%E2%91%A6%28x%2B3%29%26%23710%3B2-%28x%2B3%29%3D%E2%91%A7%283a-4b%29%287a-8b%29%2B%2811a-12b%29%288b-7a%29%3D%E2%91%A8x%28b%2Bc-d%29-y%28d-b-c%29-c-b%2Bd%3D)
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