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](/uploads/image/z/11802215-47-5.jpg?t=1%2F2+++1++++1++%EF%BC%88+%EF%BC%899%2F11++11%2F13++++A%EF%BC%8E2++B%EF%BC%8E3++++C%EF%BC%8E1+++D%EF%BC%8E7%2F9)
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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