(1)12xy2-(-4x3y)(2)a2-a4+(-a2)3(3)(x-3y)(x-12y)(4)(x+1)(x-1)-(x+2)2.-数学

题目简介

(1)12xy2-(-4x3y)(2)a2-a4+(-a2)3(3)(x-3y)(x-12y)(4)(x+1)(x-1)-(x+2)2.-数学

题目详情

(1)
1
2
xy2-(-4x3y)

(2)a2-a4+(-a23
(3)(x-3y)(x-
1
2
y)

(4)(x+1)(x-1)-(x+2)2
题型:解答题难度:中档来源:不详

答案

(1)原式=-2x4y3;
(2)原式=a6-a6=0;
(3)原式=x2-class="stub"1
2
xy-3xy+class="stub"3
2
y2=x2-class="stub"7
2
xy+class="stub"3
2
y2;
(4)原式=x2-1-(x2+4x+4)=x2-1-x2-4x-4=-4x-5.

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