Question

[2分之1-(4分之3-5分之3)]÷10分之7=?

Answer 1

[1/2-(3/4-3/5)]÷7/10
=[1/2-(15/20-12/20)]÷7/10
=(1/2-3/20)÷7/10
=(10/20-3/20)÷7/10
=7/20÷7/10
=7/20×10/7
=1/2