因式分(1)(a-b)(x-y)-(b-a)(x+y);(2)x2-4xy+4y2-1.
题型:解答题难度:一般来源:不详
因式分 (1)(a-b)(x-y)-(b-a)(x+y); (2)x2-4xy+4y2-1. |
答案
(1)(a-b)(x-y)-(b-a)(x+y), =(a-b)(x-y)+(a-b)(x+y), =(a-b)(x-y+x+y), =2x(a-b);
(2)x2-4xy+4y2-1, =(x2-4xy+4y2)-1, =(x-2y)2-1, =(x-2y+1)(x-2y-1). |
举一反三
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下列各式中能用完全平方公式分解的是( )A.4x2+4x-1 | B.x2+xy+y2 | C.-2x2+4x-2 | D.2x2+4x+1 |
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______-2xy+4y2=(______)2;x2+x+______=(______)2. |
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