做个数字推理题?3,9,27,81()A.243 B.342 C.433 D.135 8,8,12,24,60( )A.

5个回答

  • 3,9,27,81(=81*3=243)A.243 B.342 C.433 D.135

    3=3^1

    9=3^2

    27=3^3

    81=3^4

    243=3^5

    8,8,12,24,60(180 )A.90 B.120 C.180 D.240

    8/8=1

    12/8=1.5

    24/12=2

    60/24=2.5

    x/60=3,则x=180

    8,14,26,50(98)A.76 B.98 C.100 D.104

    14-8=6

    26-14=12

    50-26=24

    98-50=48

    66,83,102,123 (=123+23=146)A.144 B.145 C.146 D.147

    83-66=17

    102-83=19

    123-102=21

    146-123=23

    4,13,40,121,361(364+243*3=1093)A.1090 B.1094 C.728 D.1093

    13-4=9

    40-13=27

    121-40=81

    364-121=243

    1093-364=729

    93,114,136,159(=159+24=183)A.180 B.183 C.185 D.187

    114-93=21

    136-114=22

    159-136=23

    183-159=24

    7,19,22,28,37 (37)A.47 B.49 C.51 D.53

    解法1 37

    奇数位7、22、37 相差15

    偶数位19 28 37 相差9

    解法2 49

    从19位开始

    22-19=3

    28-22=6

    37-28=9

    49-37=12

    2/3,7/12,11/30,15/56(=(15+4)/(56+34)=19/90)A.17/72 B.19/64 C.19/90 D.23/121

    3/2=1+1/2

    7/12=1/3+1/4

    11/30=1/5+1/6

    15/56=1/7+1/8

    1/9+1/10=19/90