0^0无意义
所以x-2≠0
x≠2
10^(2m-n)=10^2m/10^n=(10^m)^2/10^n=3^2/2=9/2
3^(6m-4n)=3^6m/3^4n=(3^2m)^3/(3^2n)^2=6^3/(9^n)^2=216/8^2=27/8
0^0无意义
所以x-2≠0
x≠2
10^(2m-n)=10^2m/10^n=(10^m)^2/10^n=3^2/2=9/2
3^(6m-4n)=3^6m/3^4n=(3^2m)^3/(3^2n)^2=6^3/(9^n)^2=216/8^2=27/8