1. 5^x<=25</p>
5^x<=5^2</p>
x<=2</p>
2. 3^-x>3^2(2x-1)
-x>4x-2
-5x>-2
x<0.4</p>
3. (7/10)^x>=100/49
(10/7)^-x>=(10/7)^2
-x>=2
x<=-2</p>
4. 2^x + 2^3 × 2^x < 3^2
2^x × (1+8) < 9 | ÷9
2^x<1</p>
x<0</p>
5. 2^2x + 5×2^x -14 <=0</p>
t= 2^x , t>0
t^2+5t-14<=0</p>
D=25+14×4= 9^2
t1=2
t2=-7
х>1