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比较下列各题中两个数的大小:
(1)30.8,30.7;(2)0.75-0.1,0.750.1.
(1)0.8-0.1,0.8-0.2;
(2)1.70.3,0.93.1;
(3)a1.3,a2.5(a>0,且a≠1).
(1)
(2)
(3)
(4)