计算:[(2x+3y)^2-2x(2x+3y)]/(-4y)

问题描述:

计算:[(2x+3y)^2-2x(2x+3y)]/(-4y)

[(2x+3y)^2-2x(2x+3y)]/(-4y)
=(2x+3y)(2x+3y-2x)/(-4y)
=3y(2x+3y)/(-4y)
=-3/4(2x+3y)