因式分(1)4x3y+4x2y2+xy3;(2)(x+y)2-4(x十y-1);(3)(x-y)2+4xy;(4)x4y4-8x2y2+16;(5)(a2+b2
题型:解答题难度:一般来源:不详
因式分 (1)4x3y+4x2y2+xy3; (2)(x+y)2-4(x十y-1); (3)(x-y)2+4xy; (4)x4y4-8x2y2+16; (5)(a2+b2)2-4a2b2; (6)(x-1)(x-3)+1. |
答案
(1)4x3y+4x2y2+xy3 =xy(4x2+4xy+y2) =xy(2x+y)2;
(2)(x+y)2-4(x+y-1) =(x+y)2-4(x+y)+4 =(x+y-2)2;
(3)(x-y)2+4xy =x2-2xy+y2+4xy =x2+2xy+y2=(x+y)2;
(4)x4y4-8x2y2+16 =(x2y2-4)2 =(xy+2)2(xy-2)2;
(5)(a2+b2)2-4a2b2 =(a2+b2+2ab)(a2+b2-2ab) =(a+b)2(a-b)2;
(6)(x-1)(x-3)+1 =x2-4x+4 =(x-2)2. |
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