化简:a(a-2b)-(a-b)2
题型:解答题难度:一般来源:宁波
化简:a(a-2b)-(a-b)2 |
答案
a(a-2b)-(a-b)2, =a2-2ab-(a2-2ab+b2), =a2-2ab-a2+2ab-b2, =-b2. |
举一反三
若(-x)3=a0+a1x+a2x2+a3x3,则(a0+a2)2-(a1+a2)2的值为______. |
5xy2-{2x2y-[3xy2-(xy2-2x2y)]÷(-xy)} |
(1)计算:-3×(-2)2; (2)化简:(a+1)(a-1)-a(a-1). |
化简并求值:(m+n)2+(m+n)(m-3n);其中m=,n=1. |
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