因式分解:(1)a3-a(2)4x2y+4xy2+y3(3)a2-b2+4b-4(4)(x-2)2+x-8.
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因式分解:
(1)a3-a
(2)4x2y+4xy2+y3
(3)a2-b2+4b-4
(4)(x-2)2+x-8.
(1)a3-a
(2)4x2y+4xy2+y3
(3)a2-b2+4b-4
(4)(x-2)2+x-8.
(1)a3-a,
=a(a2-1),
=a(a+1)(a-1);
(2)4x2y+4xy2+y3,
=y(4x2+4xy+y2),
=y(2x+y)2;
(3)a2-b2+4b-4,
=a2-(b2-4b+4),
=a2-(b-2)2,
=(a+b-2)(a-b+2);
(4)解法1:(x-2)2+x-8:
=x2-4x+4+x-8
=x2-3x-4
=(x-4)(x+1);
解法2:(x-2)2+x-8:
=(x-2)2+(x-2)-6
=(x-4)(x+1).
=a(a2-1),
=a(a+1)(a-1);
(2)4x2y+4xy2+y3,
=y(4x2+4xy+y2),
=y(2x+y)2;
(3)a2-b2+4b-4,
=a2-(b2-4b+4),
=a2-(b-2)2,
=(a+b-2)(a-b+2);
(4)解法1:(x-2)2+x-8:
=x2-4x+4+x-8
=x2-3x-4
=(x-4)(x+1);
解法2:(x-2)2+x-8:
=(x-2)2+(x-2)-6
=(x-4)(x+1).
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