(1)1÷1/5=5
(2)1/2×1/2=1/4
(3)1/5-1/6=1/30
(3)4/7-(4/7-2/7)=2/7
(4)0.8×5/8=0.5
(5)10+4/5=54/5
(6)13×13/15=169/15
(7)10-1×1/4=39/4
(1)1÷1/5=5
(2)1/2×1/2=1/4
(3)1/5-1/6=1/30
(3)4/7-(4/7-2/7)=2/7
(4)0.8×5/8=0.5
(5)10+4/5=54/5
(6)13×13/15=169/15
(7)10-1×1/4=39/4