4^13 : 8^6 + 7^3 - 5^2 * [625:5^4 + 16:(7*3^2-55)] =
= (2^2)^13 : (2^3)^6 + 7^3 - 5^2 * [5^4 : 5^4 + 16:(7*9-55) =
= 2^26 : 2^18 + 7^3 - 5^2 * [1 + 16:(63-55)] =
= 2^8 + 7^3 - 5^2 * (1+16:8) =
= 2^8 + 7^3 - 5^2 * (1+2) =
= 2^8 + 7^3 - 3 * 5^2 =
= 256 + 343 - 3*25 =
= 599 - 75 = 524