因式分解:(1)4x3y+4x2y2+xy3;(2)(x+y)2-4(x十y-1);(3)(x-y)2+4xy;(4)x4y4-8x2y2+16;
因式分解:(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-...
因式分解:(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.
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(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.
=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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