76三1

问题描述:

76三1
合并多式项:
5 ² x²y-5xy²
- xy - -------- +x²y
2 2

通分
原式=5xy²/2-(x²y-5xy²)/2+2x²y/2
=(5xy²-x²y+5xy²+2x²y)/2
=(10xy²+x²y)/2