=（35+84-45）/105
=74/10513分之10-5分之2+2分之1=
11分之9-【9分之4+11分之2】=
简便计算回答对了我会提高悬赏10/13-2/5+1/2
=(100-52+65)/130
=113/130
9/11-(4/9+2/11)
=9/11+2/11-4/9
=7/11-4/9
=(63-44)/99
=19/99