﹙2x²y+3xy²﹚-﹙6x²y-3xy²﹚

问题描述:

﹙2x²y+3xy²﹚-﹙6x²y-3xy²﹚

﹙2x²y+3xy²﹚-﹙6x²y-3xy²﹚
=2x²y+3xy²-6x²y+3xy²
=-4x²y+6xy²