问题
解答题
分解因式:
(1)6xy2-9x2y-y3;
(2)(x2+1)2-4x2.
答案
(1)6xy2-9x2y-y3
=-y(y2-6xy+9x2)
=-y(3x-y)2;
(2)(x2+1)2-4x2
=(x2+1+2x)(x2+1-2x)
=(x+1)2(x-1)2.
分解因式:
(1)6xy2-9x2y-y3;
(2)(x2+1)2-4x2.
(1)6xy2-9x2y-y3
=-y(y2-6xy+9x2)
=-y(3x-y)2;
(2)(x2+1)2-4x2
=(x2+1+2x)(x2+1-2x)
=(x+1)2(x-1)2.