问题:
9xy(x-y)(x+1)-3y(x-y)(3x+2y)+6y 2(x-y)(x+1),其中 x=-
1
3
,y=2.
9xy(x-y)(x+1)-3y(x-y)(3x+2y)+6y 2(x-y)(x+1),其中 x=-
,y=2.
1 |
3 |
参考答案: