(3x=3/4y)(3/4x-2y)
问题描述：
(3x=3/4y)(3/4x-2y)
答
(3x+3/4y)(3/4x-2y)
=3x(3/4x-2y)+3/4y(3/4x-2y)
=9/4x²-6xy+9/16xy-3/2y²
=9/4x²-87/16xy-3/2y²
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