\(\log_7 26 = \frac{\lg 26}{\lg 7} ≈ \frac{1.415}{0.845} ≈ 1.67\)
\(\log_3 7 = \frac{\lg 7}{\lg 3} ≈ \frac{0.845}{0.477} ≈ 1.77\)
\(\log_8 0.69 = \frac{\lg 0.69}{\lg 8} ≈ \frac{-0.161}{0.903} ≈ -0.18\)
\(\log_{0.36} 1.27 = \frac{\lg 1.27}{\lg 0.36} ≈ \frac{0.104}{-0.444} ≈ -0.23\)
Ответ: 1) ≈ 1.67, 2) ≈ 1.77, 3) ≈ -0.18, 4) ≈ -0.23