计算:[(2x+3y)^2-2x(2x+3y)]/(-4y)
2个回答
[(2x+3y)^2-2x(2x+3y)]/(-4y)
=(2x+3y)(2x+3y-2x)/(-4y)
=3y(2x+3y)/(-4y)
=-3/4(2x+3y)
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