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