3^x=9V3
3^x=3^2•3^1/2
3^x=3^(2 1/2)
X=2 1/2 отв:(3)
2)4^(-x^2-x)>4^0
-x^2-x>0
X(-x-1)>0
X=0;x=-1
- +. -
------•--------•-------
-1. 0
(-1;0) отв:(3)
3)(1/3)^х<=1/243<br>(1/3)^х<=(1/3)^5<br>Х>=5
Отв:(3)
4)(8/5)^(3x-7)<=(5/8)^(7x-3)<br>(8/5)^(3x-7)<=(8/5)^(3-7x)<br>3x-7<=3-7x<br>3x+7x<=3+7<br>10x<=10<br>X<=1<br>Отв:(2)