7. log25(3125) + log0.04(0.008)

log25(3125) = log(5^2)(5^5) = (5/2) * log5(5) = 5/2 = 2.5
log0.04(0.008) = log(4/100)(8/1000) = log(1/25)(1/125) = log(5^(-2))(5^(-3)) = (-3)/(-2) * log5(5) = 3/2 = 1.5
log25(3125) + log0.04(0.008) = 2.5 + 1.5 = 4
Ответ: 4