(1/2 - 1/3)^3 : (1/3 - 1/4)^2 * (3/8)^2 = 3/32
1) 1/2 - 1/3 = 3/6 - 2/6 = 1/6
2) (1/6)^3 = 1/6 * 1/6 * 1/6 = 1/216
3) 1/3 - 1/4 = 4/12 - 3/12 = 1/12
4) (1/12)^2 = 1/12 * 1/12 = 1/144
5) 1/216 : 1/144 = 1/216 * 144/1 = 144/216 = 2/3
6) (3/8)^2 = 3/8 * 3/8 = 9/64
7) 2/3 * 9/64 = (1*3)/(1*32) = 3/32