已知x^m=3,x^n=1/3,求x^2m-3n的值
4个回答
(x^m)^2=x^2m=3^2=9
(x^n)^3=x^3n=(1/3)^3=1/27
x^2m-3n
=(x^m)^2÷(x^n)^3
=9÷1/27
=243
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