8又5分之4÷[7.8+0.625×(4分之11-1.15)]

问题描述:

8又5分之4÷[7.8+0.625×(4分之11-1.15)]

原式=8.8÷[7.8+5/8*(2.75-1.15)]
=8.8÷[7.8+5/8*1.6]
=8.8÷[7.8+1]
=1

8又5分之4÷[7.8+0.625×(4分之11-1.15)]
=8.8÷(7.8+0.625×1.6)
=8.8÷(7.8+1)
=8.8÷8.8
=1

不懂可追问,有帮助请采纳,谢谢!