5x²-3xy²-2（2x²y-xy²）怎么写?

分类: 作业答案 • 2021-12-18 21:49:45

问题描述：

答

5x²-5xy-4x²y

答

5x²-3xy²-2(2x²y-xy²)
=5x²-3xy²-4x²y+2xy²
=5x²-4x²y+(-3xy²+2xy²)
=5x²-4x²y-xy²
给分吧

答

5x²-3xy²-2(2x²y-xy²)
=5x²-3xy²-4x²y+2xy²
=5x²-4x²y+(-3xy²+2xy²)
=5x²-4x²y-xy²