13/7*7/1*13/6
=13*7*13/(7*6)
=169/6
11/7*7/1+7/10*11/7
=11/7*(7/1+7/10)
=11/7*7/11
=1
(6/1+4/3-3/2)*12
=2+9-8
=3你知道/是分数线吗我怎么不知道？8/5*7/6-8/3*7/6