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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