问题
解答题
计算:
(1)分解因式:6xy2-9x2y-y3
(2)(a2b-2ab2-b3)÷b-(a+b)(a-b)
答案
(1)6xy2-9x2y-y3,
=-y(9x2-6xy+y2),
=-y(3x-y)2;
(2)(a2b-2ab2-b3)÷b-(a+b)(a-b),
=a2-2ab-b2-a2+b2,
=-2ab.
计算:
(1)分解因式:6xy2-9x2y-y3
(2)(a2b-2ab2-b3)÷b-(a+b)(a-b)
(1)6xy2-9x2y-y3,
=-y(9x2-6xy+y2),
=-y(3x-y)2;
(2)(a2b-2ab2-b3)÷b-(a+b)(a-b),
=a2-2ab-b2-a2+b2,
=-2ab.