(2×y+x²-y²)-(x²-y²-3xy) 计算题,

来源：学生作业帮助网编辑：作业帮时间：2024/04/29 21:16:58

(2×y+x²-y²)-(x²-y²-3xy) 计算题,
(2×y+x²-y²)-(x²-y²-3xy) 计算题,

原式=2xy+x2-y2-x2+y2+3xy
=5xy