若x,y均不等于0或1,且(x^n+2*y^2m+n)^3=x^9*y^15,求3m^2+1/2mn-5n^3的值
1个回答
n+2=3,2m+n=5
m=2,n=1
3m^2+1/2mn-5n^3=8
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