几道数字推理,4.9,1,4,3,40,( ) A.81 B.80 C.121 D.1201.1/3 3/9 2/3 1

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  • 4.9,1,4,3,40,( ) A.81 B.80 C.121 D.120除以3的余数,0 1 1 0 1 11.1/3 3/9 2/3 13/21 ( ) A.17/27 B.17/26 c.19/27 D.19/28应该是1/3,5/9,2/3,13/21通分后为1/3,5/9,12/18,13/21,(17/27)分母减分子分别为2,4,6,8,103.1 1/3 1/9 1/27 1/18 ( ) A.1/243 B.1/255 C.1/162 D.1/1641/18应该是1/81,选a3 1/61 5 20 60()A.90 B.150 C.120 D.180应该是1/6 1 5 20 60()倍数6 5 4 3 2,选c4.5 8 17 24 37 ( ),A.48 B.49 C.63 D.80 2 3 4 5 6 的平方加1减1,选a"