8又5分之4÷[7.8+1/4*(2.75+1.25)]

问题描述:

8又5分之4÷[7.8+1/4*(2.75+1.25)]

8又5分之4÷[7.8+1/4*(2.75+1.25)]
=8.8÷(7.8+1/4*4)
=8.8÷(7.8+1)
=8.8÷8.8
=1