展开得2x^2y+3xy^2-6x^2y-3xy^2
=-4x^2y
(2x^2y+3xy^2)-(6x^2y-3xy^2)
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化简：（2x2y-3xy2）-（6x2y-3xy2）．
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化简：（2x2y-3xy2）-（6x2y-3xy2）．