化简(1)(2ab2)3-(9ab2)?(-ab2)2(2)(-8x3y2+12x3y-4x2)÷[-(2x)2](3)(x-4y)(2x+3y)-
化简(1)(2ab2)3-(9ab2)?(-ab2)2(2)(-8x3y2+12x3y-4x2)÷[-(2x)2](3)(x-4y)(2x+3y)-(x+2y)(x-y)...
化简(1)(2ab2)3-(9ab2)?(-ab2)2(2)(-8x3y2+12x3y-4x2)÷[-(2x)2](3)(x-4y)(2x+3y)-(x+2y)(x-y)(4)(2x+y-3z)(2x-y+3z)(5)[(2x+y)2-(2x+y)(2x-y)]÷2y(6)(-xm-ym)(x2m-y2m)(-xm+ym)
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(1)原式=8a3b6-9a3b6=-a3b6;
(2)原式=(-8x3y2+12x3y-4x2)÷(-4x2)=2xy2-3xy+1;
(3)原式=3x2-5xy-12y2-x2-xy+2y2=2x2-6xy-10y2;
(4)原式=4x2-(y-3z)2=4x2-y2+6yz-9z2;
(5)原式=(4x2+4xy+y2-4x2+y2)÷2y=(4xy+2y2)÷2y=2x+y;
(6)原式=(-xm-ym)(-xm+ym)(x2m-y2m)=(x2m-y2m)2=x4m-2x2my2m+y4m.
(2)原式=(-8x3y2+12x3y-4x2)÷(-4x2)=2xy2-3xy+1;
(3)原式=3x2-5xy-12y2-x2-xy+2y2=2x2-6xy-10y2;
(4)原式=4x2-(y-3z)2=4x2-y2+6yz-9z2;
(5)原式=(4x2+4xy+y2-4x2+y2)÷2y=(4xy+2y2)÷2y=2x+y;
(6)原式=(-xm-ym)(-xm+ym)(x2m-y2m)=(x2m-y2m)2=x4m-2x2my2m+y4m.
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