已知mn均为正整数如果(x的m次方)的3次方*(x的n次方)的平方=x的9次方*x的5次方,n是m的2倍,求m,n值

问题描述:

已知mn均为正整数如果(x的m次方)的3次方*(x的n次方)的平方=x的9次方*x的5次方,n是m的2倍,求m,n值

x^3m*x^2n=x^9*x^5
x^(3m+2n)=x^(9+5)
3m+2n=14
又因为n是m的2倍
所以:3m+4m=14
m=2
n=4

(X^m)^3 * (X^n)^2=X^9 * X^5 => X^(3m+2n)=X^14
=> 3m+2n=14 & n=2m =>3m+4m=14 =>m=2 ,n=4

m=2 n=4

(x^m)^3*(x^n)^2=x^9*x^5
x^(3m+2n)=x^14
3m+2n=14
又:
n=2m
解得:m=2,n=4