解：a=2^1.2 b=(1/2)^(-0.2)=2^0.2 c=2log5^2=log5^4因为2.1>0.2>0所以2^2.1>2^0.2>2^0>1 即a>b>1 即1而1<4<5所以log5^1即c<1所以c<1即c
