Question

2分之1-(4分之3-5分之3)除以10分之7

Answer 1

=1/2-(3/4-3/5)x10/7
=1/2-(15/20-12/20)x10/7
=1/2-3/20x10/7
=1/2-3/14
=7/14-3/14
=4/14
=2/7
希望能帮你忙,懂了请采纳,