Lets solve by parts numerator and denominator.
a)
Numerator:
-| 5^2 - 6^2|
-| 25 - 36|
-|-11|
-11
Denominator:
5^3 = 125
(-8)^2 = 64
-2(7) = 14
125 - 64 - 8 - 14
39
Answer = -11/39
b)
Numerator:
3 - 7/10
30/10 - 7/10
23/10
Denominator:
5/12 - 7/8 + 17/10
400/960 - 840/960 + 1632/960
1192/960 = 298/240 = 149/120
Answer = (23/10) / (149/120)
(23/10) * (120/149)
(23*120) / (10*149)
276 / 149
