计算:(1)(π-3)0-(12)-1+(23)2012×(-1.5)2013 (2)(2xy2)3-(9xy2)-(-xy2)2(3)3(x-1
题型:解答题难度:一般来源:不详
计算: (1)(π-3)0-()-1+()2012×(-1.5)2013 (2)(2xy2)3-(9xy2)-(-xy2)2 (3)3(x-1)2-2(x-2)(x+2) (4)(a-2b+c)(a+2b-c) |
答案
(1)原式=1-2-1.5=-2.5; (2)原式=8x3y6-9xy2.x2y4 =8x3y6-9x3y6 =-x3y6; (3)原式=3(x2-2x+1)-2(x2-4) =x2-6x+11; (4)原式=a2-(2b-c)2 =a2-4b2+4bc-c2. |
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