当|y+1|=0时,求6y^n+1-3y^n-4y^n+1+y^2n+2+y^n-2y^2n+2的值(n为正整数)
问题描述：
当|y+1|=0时,求6y^n+1-3y^n-4y^n+1+y^2n+2+y^n-2y^2n+2的值(n为正整数)
答
|y+1|=0
y=-1
6y^n+1-3y^n-4y^n+1+y^2n+2+y^n-2y^2n+2
=6-y^2n=6-1=5