先化简再求值2x减括号y减2x加三括号3x减二括号2x加y括

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题目粗猛激州不全岩铅桥啊
2x-(y-2x+3)3x-2(2x+Y)
=2x-3xy+6x^2-9X-4x-2y
=6x^2-3xy-2x-2y

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