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从1,3,5,7,9这五个数中,每次取出两个不同的数分别记为a,b,共可得到lg...
从1,3,5,7,9这五个数中,每次取出两个不同的数分别记为a,b,共可得到lga-lgb的不同值的个数是( )
A.9
B.10
C.18
D.20
考点分析:
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