已知多项式3x2次方+my-8与多项式-nx的2次方+2y+7的差中,不含有x,y,求n的m次方+m的n次方的值.要详解
问答/483℃/2024-05-08 17:25:10
优质解答：
3x^2+my-8-(-nx^2+2y+7)
=(3+n)x^2+(m-2)y-15
不含xy,则
3+n=0,n=-3
m-2=0,m=2
n^m+m^n
=(-3)^2+2^(-3)
=9+1/8
=73/8
问答/483℃/2024-05-08 17:25:10
3x^2+my-8-(-nx^2+2y+7)
=(3+n)x^2+(m-2)y-15
不含xy,则
3+n=0,n=-3
m-2=0,m=2
n^m+m^n
=(-3)^2+2^(-3)
=9+1/8
=73/8