=7/8;=3/4;=7/200:-) :-) :-) :-) :-) :-) :-) :-) :-) :-) :-)
5) 1-2х > 0 => x < 1/2
6) 1 = log2_2 => x-4 < 2 => x < 6
и надо учесть ОДЗ x-4 > 0 => x>4 => ответ: (4,6)
7) 5 ^ 0 = 1 => x^2 = 1 => x = 1 и x = -1
10) lgx= lg(625sqrt(a)b) = lg625 + lgsqrt(a)+lg(b)
299 301
889 891
798 800
500 502
209 211
998 1000