问题
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:1,3,7,15,31,()。 A.61 B.62 C.63 D.64
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1/2,3/4,7/8,15/16,(),63/64。A.31/34 B.33/34 C.31/32 D.23/32
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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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2,3,5,7,12,15,(),() A.26,31B.17,21C.27,31D.16,21
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2,3,5,7,12,15,(),() A.26,31B.17,21C.27,31D.16,21
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1/2,3/4,7/8,15/16,(),63/64。A.31/34B.33/34C.31/32D.23/32