计算.(1)(a-2)2+4(a-1)(2)(a+2)(a+2)-a(a+1)(3)(a-b-1)(a+b-1)(4)(x+2y)2(x-2y)-数学

题目简介

计算.(1)(a-2)2+4(a-1)(2)(a+2)(a+2)-a(a+1)(3)(a-b-1)(a+b-1)(4)(x+2y)2(x-2y)-数学

题目详情

计算.
(1)(a-2)2+4(a-1)
(2)(a+2)(a+2)-a(a+1)
(3)(a-b-1)(a+b-1)
(4)(x+2y)2(x-2y)
题型:解答题难度:中档来源:不详

答案

(1)原式=a2-4a+4+4a-4
=a2;

(2)原式=a2-4-a2-a
=-a-4;

(3)原式=(a-1)2-b2
=a2-2a+1-b2;

(4)原式=(x2+4xy+4y2)(x-2y)
=x3-4xy2+2x2y-8y3.

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