﹙2x²y＋3xy²﹚－﹙6x²y－3xy²﹚
问题描述：
﹙2x²y＋3xy²﹚－﹙6x²y－3xy²﹚
答
﹙2x²y＋3xy²﹚－﹙6x²y－3xy²﹚
=2x²y＋3xy²－6x²y+3xy²
=-4x²y+6xy²