问题
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4,5,15,6,7,35,8,9,()A.27 B.15 C.72 D.63
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4,5,15,6,7,35,8,9,()A.27B.15 C.72D.63
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4,5,15,6,7,35,8,9,()A.27 B.15C.72D.63
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4,5,15,6,7,35,8,9,()A.27B.15 C.72D.63
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4,5,15,6,7,35,8,9,()A.27B.15C.72D.63
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(3/4+1/5)+(4/5+1/6)+(5/6+1/7)+(6/7+1/8)+(7/8+1/9)+(8/9+1/10)=()。A.6.05B.5.65C.5.35D.5.05