[2^12 × 2^18 + 5^70 : 5^10 - (3^25)^2] : [4^2 × 2^3 × 2^23 + (5^15)^2^2 - (3^2)^5^2] = (2^30 + 5^60 - 3^50) : [(2^2)^2 × 2^26 + (5^15)^4 - (3^2)^25] = (2^30 + 5^60 - 3^50) : (2^4 × 2^26 + 5^60 - 3^50) = (2^30 + 5^60 - 3^50) : (2^30 + 5^60 - 3^50) = 1
