问题:
(1)先化简,再求值:(a+1) 2-(3a 2+a)÷a,其中a=-3.
(2)已知x+y=3,xy=-2.求(x-1)(y-1)的值.
(1)先化简,再求值:(a+1) 2-(3a 2+a)÷a,其中a=-3.
(2)已知x+y=3,xy=-2.求(x-1)(y-1)的值.
(2)已知x+y=3,xy=-2.求(x-1)(y-1)的值.
参考答案: