-3/4和-4/5
-3/4=-1+1/4
-4/5=-1+1/5
∵1/4>1/5
所以-3/4>-4/5
-|-3/7|=-3/7
-(+13/6)=-13/6
-3/7=-18/42
-13/6=-91/42
-18/42>-91/42
∴-3/7>-13/6
-3/4与-4/5,-|-3/7|和-（+13/6）比较大小,明天交!
-3/4和-4/5
-3/4=-1+1/4
-4/5=-1+1/5
∵1/4>1/5
所以-3/4>-4/5
-|-3/7|=-3/7
-(+13/6)=-13/6
-3/7=-18/42
-13/6=-91/42
-18/42>-91/42
∴-3/7>-13/6