1，LG 0.36 = lg36/ 100 = lg36-2 = 2lg 6-2 = 2(lg2+lg3)-2 = 2 *(0.30 10+0.477 1)-2 =-0.4438
2, let x = 5 20, and both sides take logarithm, lgx = 20lg5 = 20 * (1-lg2) =13.98,
∴ 10^ 13