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比较下列各组中两个值的大小 :
(1)ln0.3,ln2;
(2)loga3.1,loga5.2(a>0,且a≠1);
(3)log30.2,log40.2;
(4)log3π,logπ3.
(1)log31.9,log32;
(2)log23,log0.32;
(3)logaπ,loga3.141.
比较下列各组中两个值的大小:
(1)
(2)