(-2y/3x)^-2÷5y/6x÷(-3x^2/y)^3

问题描述:

(-2y/3x)^-2÷5y/6x÷(-3x^2/y)^3

=9x²/4y² ×6x/5y ×1/(-y³/27x的6次方)
=-2/5x³