Question

设a=log1/2 0.2,b=log2 0.5,c=log2 0.2,则a、b、c之间大小关系为?

Answer 1

画图,

a=log1/2 0.2=-log₂0.2＞0,

b=log₂0.5＜0,

c=log₂0.2＜0,

且b=log₂0.5＞log₂0.2=c,

故a＞b＞c.