计算 (5y/6x^3)^2·{-(3x^4/5y^2)}^3
问题描述：
计算 (5y/6x^3)^2·{-(3x^4/5y^2)}^3
答
(5y/6x^3)^2·{-(3x^4/5y^2)}^3
= (25y^2/36x^6)·{-27x^12/125y^6)
=3x^6/20y^4