解:原式=-9+30/25 =-9+6/5 =36/5
先乘除迹罩芦敏后加减-9-30*-1/25=-9+30/25=-225/25+30/姿哗闹25=-195/25=-7又4/5 或39/5
原式=-9-(30*-25) =-9-(并肢好-750) =741望采饥缓纳!谢谢!祝你学习进绝铅步!
直接计算,得-7又5分之4
写清楚点......(*^__^*)