1) $$log_5 125 = 3$$
2) $$lg 0.01 = lg \frac{1}{100} = -2$$
3) $$2^{log_2 3} = 3$$
4) $$3^{2 log_3 7} = 3^{log_3 7^2} = 3^{log_3 49} = 49$$
5) $$log_2 68 - log_2 17 = log_2 \frac{68}{17} = log_2 4 = 2$$
Ответ: 1) 3; 2) -2; 3) 3; 4) 49; 5) 2