При каком k верно равенство.

1. (2^3*2^k = 2^16): k = 16-3 = 13. 2. (3^k*3^2 = 3^18): k = 18-2 = 16. 3. ((7^2)^3)^5 = 7^k): k = 2*3*5 = 30. 4. ((5^k*5^1)^2 = 5^10): k = 10/2 - 1 = 4.