=5/7-2/7+3/5=3/7+3/5=15/35+21/35=36/35=1又1/35
你好:5/7+(3/5-2/7)=5/7-2/7+3/5=3/7+3/5=15/35+21/35=36/35愿对你有帮助!
5/7+(3/5-2/7)=5/7+3/5-2/7=36/35