问题
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:1,3,7,15,31,()。 A.61 B.62 C.63 D.64
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1/3,1/15,1/35,()。 A.1/65 B.1/75 C.1/125 D.1/63
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1/15,4/35,7/63,10/99,()。 A.14/121 B.17/133 C.13/143 D.17/152
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计算1/4+3/8+7/16+15/32+31/64+63/128+127/256+255/512+511/1024=? A.3×(513/1024)B
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1/3,1/15,1/35,()。A.1/65B.1/75C.1/125 D.1/63
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1/2,3/4,7/8,15/16,(),63/64。A.31/34B.33/34C.31/32D.23/32