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4, 3/2, 20/27, 7/16, 36/125, () A.39/144 B.11/54 C.68/196 D.7
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1,1/2,3/13,1/10,5/121,()。A. 7/144B. 3/182C. 5/169 D. 9/196
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81,64,121,36()16 A.144 B.169 C.196 D.225
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81,64,121,36,(),16 A.144 B.169 C.196 D.225
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81,64,121,36,(),16 A.144 B.169 C.196 D.25
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1,1/2,3/13,1/10,5/121,()。 A.7/144 B.3/182 C.5/169 D.9/196
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20/9,4/3,7/9,4/9,1/4,() A.5/36 B.1/6 C.1/9 D.1/144