已知(xmyn)2÷(x2y)3=x4y5,求2m-n的值.

问题描述:

已知(xmyn2÷(x2y)3=x4y5,求2m-n的值.

∵(xmyn2÷(x2y)3=x2m-6y2n-3=x4y5
∴2m-6=4,2n-3=5,
解得:m=5,n=4,
则2m-n=2.