计算:(1)(a+b)(-a+b)(a-b)(-a-b)=______;(2)(x+y)2-2(x+y)(x-y)+(x-y)2=______.
题型:解答题难度:一般来源:不详
计算: (1)(a+b)(-a+b)(a-b)(-a-b)=______; (2)(x+y)2-2(x+y)(x-y)+(x-y)2=______. |
答案
(1)(a+b)(-a+b)(a-b)(-a-b), =(a+b)(a-b)(-a+b)(-a-b), =(a2-b2)(a2-b2), =a4-2a2b2+b4;
(2)(x+y)2-2(x+y)(x-y)+(x-y)2, =[(x+y)-(x-y)]2, =(x+y-x+y)2, =4y2 |
举一反三
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