问题
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:1,4/3,13/9,40/27,()。A.121/81 B.67/81 C.121/51 D.67/51
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:3/15,1/3,3/7,1/2,()。A.5/8 B.4/9 C.15/27 D.-3
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3/15,1/3,3/7,1/2,()A.5/8 B.4/9 C.15/27 D.-3
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3/15,1/3,3/7,1/2,()。A.5/8 B.4/9 C.15/27 D.-3
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3/15,1/3,3/7,1/2,() A.5/8 B.4/9 C.15/27 D.-3
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1/8,1/9,9/64,(),3/8 A.3/7B.27/115C.4/9D.3/11