化简：2x²y+{2xy-[3x²y-2(-3x²y+2xy)]-4xy}化简：2x²y+{2xy-[3x²y-2(-3x²y+2xy)]-4xy}
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化简：2x²y+{2xy-[3x²y-2(-3x²y+2xy)]-4xy}化简：2x²y+{2xy-[3x²y-2(-3x²y+2xy)]-
化简：2x²y+{2xy-[3x²y-2(-3x²y+2xy)]-4xy}化简：2x²y+{2xy-[3x²y-2(-3x²y+2xy)]-4xy}
化简：2x²y+{2xy-[3x²y-2(-3x²y+2xy)]-4xy}
化简：
2x²y+{2xy-[3x²y-2(-3x²y+2xy)]-4xy}
化简：2x²y+{2xy-[3x²y-2(-3x²y+2xy)]-4xy}化简：2x²y+{2xy-[3x²y-2(-3x²y+2xy)]-4xy}
2x²y+{2xy-[3x²y-2(-3x²y+2xy)]-4xy}
=2x²y+{2xy-[3x²y+6x²y-4xy]-4xy}
=2x²y+{-2xy-9x²y+4xy}
=2x²y+2xy-9x²y
=2xy-7x²y