计算:(1)(3x+2)-2(x2-x+2)(2)(a+b)2-(a-b)2(3)82012×0.1252011(4)(9x3y2-6x2y+3xy2)÷(-3
题型:解答题难度:一般来源:不详
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) |
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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