5xy2-【3xy2-(4xy2-2x2y)】+2x2y】+2x2y-xy2 化简,再求值

分类: 作业答案 • 2022-02-27 23:38:22

问题描述：

答

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

答

5xy²-[3xy²-(4xy²-2x²y)+2x²y]+2x²y-xy²
=5xy²-(3xy²-4xy²+2x²y+2x²y)+2x²y-xy²
=5xy²-3xy²+4xy²-2x²y-2x²y+2x²y-xy²
=5xy²-2x²y

答

5xy2-【3xy2-(4xy2-2x2y)】+2x2y】+2x2y-xy2
=5xy2-3xy2+4xy2-2x2y-2x2y+2x2y-xy2
=5xy²-2x²y