题目内容
把下列各式分解因式:(1)(x+y)(x-y)-(x+y)2;
(2)(3a-4b)(7a-8b)+(11a-12b)(7a-8b).
答案:
解析:
解析:
| 解:(1)(x+y)(x-y)-(x+y)2=(x+y)[(x-y)-(x+y)]=(x+y)·(-2y)=-2y(x+y);
(2)(3a-4b)(7a-8b)+(11a-12b)(7a-8b)=(7a-8b)[(3a-4b)+(11a-12b)] =(7a-8b)(14a-16b)=2(7a-8b)2.
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