5^-x=a24/(1-a²)-1/(a-6)≤0(24a-144-1+a²)/(a²-1)(a-6)≥0(a²+24a-145)/(a-1)(a+1)(a-6)≥0a²+24a-145=0a1+a2=-24 U a1*a2=-145⇒a1=-29 U a2=5a-1=0⇒a=1a+1=0⇒a=-1a-6=0⇒a=6 _ + _ + _ +-----------[-29]-----------(-1)------------(1)-----------[5]-------------(6)--------------29≤a<-1⇒-29≤5^-x<-1 нет решения1<a≤5⇒1<5^-x≤5⇒-1≤x<0a>6⇒5^-x>6⇒x<log(0,2)6