-6√2m-4n/x^2÷4/5√m-2n/2mx
问题描述：
-6√2m-4n/x^2÷4/5√m-2n/2mx
答
（-6√2m-4n）/x^2÷（4/5√m-2n）/2mx
=（-6√2m-4n）/x^2×2mx/(4/5√m-2n)
=(-6√2m-4n)m/(2/5√m-2n)x
=-15√2*m/x