6a^m+5b^m/(-2ab^n)= -3a^7b求m^n

问题描述:

6a^m+5b^m/(-2ab^n)= -3a^7b求m^n

6a^(m+5)b^m/(-2ab^n)=-3a^(m+4)b^(m-n)=-3a^7b
m+4=7 m=3
m-n=1 n=2
m^(-n)=3^(-2)=1/9
m=3,n=2,m^-n=9分之1