问题
解答题
分解因式:
(1)3x-12x3
(2)x2+y2-1-2xy.
答案
(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).
分解因式:
(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).