问题
解答题
分解因式: (1)x2y-2xy2+y3 (2)x(x-y)+y(y-x) (3)18.9×
(4)19992-4002×1999+20012 |
答案
(1)原式=y(x-y)2
(2)原式=(x-y)(x-y)=(x-y)2
(3)原式=
(18.9+37.1-1)=13 55
×55=1313 55
(4)原式=2=4.
分解因式: (1)x2y-2xy2+y3 (2)x(x-y)+y(y-x) (3)18.9×
(4)19992-4002×1999+20012 |
(1)原式=y(x-y)2
(2)原式=(x-y)(x-y)=(x-y)2
(3)原式=
(18.9+37.1-1)=13 55
×55=1313 55
(4)原式=2=4.