A.28/45
B.117/191
C.31/47
D.122/199
[单选题]31 29 23 ( ) 17 13 11A.21 B. 20 C. 19 D. 18
[单选题]31,29,23,( ),17,13,11。A.21B.20C.19D.18
[试题]找规律,填一填。(1)8 ,11,14 ,17,(),23 ,();(2)4,9, 16,25,(),49 ,64;(3)1, 8, 27 ,(),125 ,();(4)3, 6, 9 ,15, 24 ,(),63,()。
[单选题]1,1/3,1/6,1/10,( )A.1/15B.1/12C.1/16D.1/20
[单选题]:1,1/3,1/6,1/10,( )。A.1/15B.1/12C.1/16D.1/20
[单选题]若向量a=(1,1),b=(-1,1),c=(4,2),则c=A. 3a+b B. 3a-b C.-a+3b D. a+3b
[单选题]:-1,2,11,38,119,()。A.595 B.476 C.362 D.297.5
[单选题]-1,2,11,38,119,()。A.595 B.476 C.362 D.297.5
[单选题]设向量组A:α1=(t,1,1),α2=(1,t,1),α3=(1,1,t)的秩为2,则t等于().A . 1B . -2C . 1或-2D . 任意数
[主观题]1,1,2,2,3,4,3,5,()