((3/5•5/9:2/7):(5/8•7/30))•1 2/5= ((1/8•5/3•7/2):(1/8:7/6))•2/5
(35/48:7/48)•2/5
(35/48•48/7)•2/5
5•2/5=2
((3/5•5/9:2/7):(5/8•7/30))•1 2/5= ((1/8•5/3•7/2):(1/8:7/6))•2/5
(35/48:7/48)•2/5
(35/48•48/7)•2/5
5•2/5=2