b) 9^5-(3^5)^2+8^4-(2^4)^3 =
(3^2)^2 - 3^10 + (2^3)^4 - 2^12 =
3^10 - 3^10 + 2^12 - 2^12 =
0
c) 2^7:4^3+3^3×27:3^5+(3^1×2^4-4^2):2^3 =
2^7 : (2^2)^3 + 3^3 × 3^3 : 3^5 + (3 × 2^4 - 2^4) : 2^3 =
2^7 : 2^6 + 3^6 :3^5 + (2 × 2^4) : 2^3 =
2 + 3 + 2^5 : 2^3 =
2 + 3 + 2^2 =
2 + 3 + 4 =
9