七年级数学题3(a-b)-4(a-b)^2-(a-b)+2(a-b)^2
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七年级数学题3(a-b)-4(a-b)^2-(a-b)+2(a-b)^2
七年级数学题3(a-b)-4(a-b)^2-(a-b)+2(a-b)^2
七年级数学题3(a-b)-4(a-b)^2-(a-b)+2(a-b)^2
3(a-b)-4(a-b)^2-(a-b)+2(a-b)^2
=2(a-b)-2(a-b)^2
=2a-2b-2a^2+4ab-2b^2
3a-3b-8a+8b-a+b+4a-4b=-2a+2b
=3(a-b)-(a-b)-4(a-b)^2+2(a-b)^2
=2(a-b)-2(a-b)^2
=2a-2b-2a^2+4ab-2b^2
(a-b)和(a-b)平方合并同类
2(a-b)-2(a-b)^2