Решите уравнение 1. log2 x+log7 6= log7 18 2. log9(20x-16)-log9 - вопрос №5777511127671829201694918 от saveliy8 02.03.2020 17:27

Question

Алгебра: Решите уравнение 1. log2 x+log7 6= log7 18 2. log9(20x-16)-log9 4=log9 18

saveliy8 · Answer

1. log2 x+log7 6= log7 18log(2)x=log(7)18-log(7)6log(2)x=log(7)3x= 2. log9(20x-16)-log9 4=log9 18 ОДЗ20x-16 0⇒20x 16⇒x 0,8log(9)(20x-16)=log(9)4+log(9)18log(9)(20x-16)=log(9)7220x-16=7220x=88x=4,4...