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5,12,21,34,53,80,()A.121 B.115 C.119 D.117
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5,12,21,34,53,80,() A.115 B.117 C.119 D.121
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51221345380 () A.121B.115C.119D.117
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5,12,2l,34,53,80,() A.115 B.117 C.119 D.121
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5,12,2l,34,53,80,() A.115B.117C.119D.121
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灵活计算. 952-952÷17(34-34×25)÷15(512+119)×12+7191.28×5.37-2.8×0.53727×1115+415÷72121×117×(2009×42×8
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5 12 21 34 53 80 ( ) A.121 B.115 C.119 D.117