>>242
0<a<1のときa=1/AとおくとA>1
log{a}(x)<log{a}(y)
⇔ log{1/A}(x)<log{1/A}(y)
⇔ -log{A}(x)<-log{A}(y)
⇔ log{A}(x)>log{A}(y)
⇔ x>y
同様に
(log{a}(b))^3+2(log{a}(b))^2-3log{a}(b)>0
⇔(-log{A}(b))^3+2(-log{A}(b))^2-3(-log{A}(b))>0
⇔log{A}(b)^3-2(log{A}(b))^2-3log{A}(b)<0
⇔log{A}(b)<-1, 0<log{A}(b)<3
⇔b<1/A, 1<b<A^3
⇔b<a, 1<b<a^(-3)