已知x^m=1/3,x^n=2,求x^2m+3n
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已知x^m=1/3,x^n=2,求x^2m+3n
已知x^m=1/3,x^n=2,求x^2m+3n
已知x^m=1/3,x^n=2,求x^2m+3n
x^2m+3n
=x^2m×x^3n
=(x^m)^2×(x^n)^3
=1/3^2×2^3
=8/9
x^2m=(x^m)^2=(1/3)^2=1/9
x^3n=(x^n)^3=2^3=8
x^2m+3n=(1/9)*8=8/9
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