1/2 1 1 ( )9/11 11/13 A.2 B.3 C.1 D.7/9

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1/2   1    1  ( )9/11  11/13    A.2  B.3    C.1   D.7/9

1/2 1 1 ( )9/11 11/13 A.2 B.3 C.1 D.7/9
1/2 1 1 ( )9/11 11/13 A.2 B.3 C.1 D.7/9

1/2 1 1 ( )9/11 11/13 A.2 B.3 C.1 D.7/9
C理由:1/2 1 1 ( )9/11 11/13可化成1/2, 3/3, 5/5,( ), 9/11,11/13分子: 1,3,5,7,9,11分母: 2,3,5,7,11,13所以答案为7/7=1"
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