Question

Решите
1. (2/3)^x>1 1/2
2. 9^2x≤1/3
3. (1/7)^x^2-9≤1
4. 4^x+2^x+1-80<0
5. (1/3)^t<1/27

Answer 1

1) (2/3)^x>11/2
(2/3)^x>3/2
(2/3)^x>(2/3)^(-1)
т к 2/3<1то х<(-1)
2) 9^2x<=1/3
3^4x<=3^(-1)
4x>=-1
x>=-1/4

Answer 2

3,4,5 можете написать?