已知X^M=1/5,X^N=3,求X^3M-2N的值

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已知X^M=1/5,X^N=3,求X^3M-2N的值已知X^M=1/5,X^N=3,求X^3M-2N的值已知X^M=1/5,X^N=3,求X^3M-2N的值如果题目是:已知X^M=1/5,X^N=3,

已知X^M=1/5,X^N=3,求X^3M-2N的值
已知X^M=1/5,X^N=3,求X^3M-2N的值

已知X^M=1/5,X^N=3,求X^3M-2N的值
如果题目是:
已知X^M=1/5,X^N=3,求X^(3M-2N)的值
X^(3M-2N)
=X^(3M)÷ X^(2N)
= (X^M)^3 ÷ (X^N)^2
=(1/5)^3 ÷ 3^2
= 1/125 x 1/9
= 1 / 1125