3 /5 ÷ 1/ 2 × 3/ 4 – 2 /5

Assuming we have :

[3 /5] ÷ [1/ 2] × [3/ 4] – [ 2 /5]

In pieces

3/5 ÷ 1/ 2  =   (3/5) * (2/1)  = 6/5

6/5 * 3/4   = 18/20  = 9/10

9/10  – 2 / 5  =

9/10 – 4 / 10  =

5/10  =

1/2