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(1),;(2),.
(1)0.8-0.1,0.8-0.2; (2)1.70.3,0.93.1; (3)a1.3,a2.5(a>0,a≠1).
比较下列各题中两个值的大小:
(1)(3.97)-2,(0.5);
(2)log,log.