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:2/3,1/2,2/5,1/3,2/7,()。 A.1/4 B.1/6 C.2/11 D.2/9
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2/3,1/2,2/5,1/3,2/7,()。A.1/4 B.1/6 C.2/11 D.2/9
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.2/3,1/2,2/5,1/3,2/7,() A.1/4 B.1/6 C.2/11 D.2/9
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2/3,1/2,2/5,1/3,2/7,() A.1/4 B.1/6 C.2/11 D.2/9
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2/3, 1/2, 2/5, 1/3, 9/7,().A.1/4 B.1/6C.2/11 D.2/9
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2/3, 1/2, 2/5, 1/3, 9/7,().A.1/4 B.1/6C.2/11 D.2/9
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在○中填入“”“=”。4/5-2/5○9/10-7/10 5/8-3/8○3/4-1/4在○中填入“”“=”。 4/5-2/5 ○9/10-7/10\5/8-3/8○3/4-1/4 3/12+5/12 ○1/6+3/63/7+4/7○4/11+7/11