x^m-n=x^m/x^n=3/6=1/2,x^3m-2n=(x^m)^3/(x^n)^2=72/36=3/4
(1)已知x^m=3,x^n=6,求x^m-n,x^3m-2n的值 (2)已知x^4n+3/x^n+1=x^n+3*x^
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