代数式6mx²＋4nxy+2x+2xy-x²+y-4中若不含x²项和xy项,求6m-2n+2的值
问题描述：
代数式6mx²＋4nxy+2x+2xy-x²+y-4中若不含x²项和xy项,求6m-2n+2的值
答
6m-1=0
4n+2=0
∴m=1/6
n=-1/2
∴6m-2n+2
=1+1+2
=4