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

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<br> 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)<br>2) 9^2x<=1/3<br>3^4x<=3^(-1)<br>4x>=-1
x>=-1/4

Comments

3,4,5 можете написать?