计算:(1)(3x+2)-2(x2-x+2)(2)(a+b)2-(a-b)2(3)82012×0.1252011(4)(9x3y2-6x2y+3xy2)÷(-3xy)-数学

题目简介

计算:(1)(3x+2)-2(x2-x+2)(2)(a+b)2-(a-b)2(3)82012×0.1252011(4)(9x3y2-6x2y+3xy2)÷(-3xy)-数学

题目详情

计算:
(1)(3x+2)-2(x2-x+2)
(2)(a+b)2-(a-b)2
(3)82012×0.1252011
(4)(9x3y2-6x2y+3xy2)÷(-3xy)
题型:解答题难度:中档来源:不详

答案

(1)原式=3x+2-2x2+2x-4=-2x2+5x-2;
(2)原式=[(a+b)+(a-b)][(a+b)-(a-b)]=4ab;
(3)原式=(8×0.125)2011×8=8;
(4)原式=-3x2y+2x-y.

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