题目内容
分解因式:
(1)3x-12x3
(2)x2+y2-1-2xy.
(1)3x-12x3
(2)x2+y2-1-2xy.
(1)3x-12x3
=3x(1-4x2)
=3x(1+2x)(1-2x);
(2)x2+y2-1-2xy
=x2+y2-2xy-1
=(x-y)2-1
=(x-y+1)(x-y-1).
=3x(1-4x2)
=3x(1+2x)(1-2x);
(2)x2+y2-1-2xy
=x2+y2-2xy-1
=(x-y)2-1
=(x-y+1)(x-y-1).
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