Question 1208706
 {{{(1/2)*((2/3)-(5/6)*(3/4))}}} - multiply (5/6)*(3/4)
 {{{(1/2)*((2/3)-(15/24))}}}  - subtract (2/3)-(15/24) note: 2/3 = 16/24
 {{{(1/2)*((16/24)-(15/24))}}}
 {{{(1/2)*(1/24))}}} multiply (1/2)*(1/24)

Final Answer:

 {{{(1/48)}}}