A.-64
B.19
C.46
D.64
[单选题]1,32,81,64,25,(),1,1/8A . 8B . 7C . 6D . 2
[单选题]+1,-1,1,-1,()A.;B.1;C.-1;D.-1;
[主观题]+1,-1,1,-1,()A.+1;B.1;C.;D.-1;
[单选题]1,1,-1,-5,( )A.-1B.-5C.-9D.-11
[单选题]1, 8, 27,( )A.36B.64C.72D.81
[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]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
[单选题]:-2,1,-8/27,1/16,( )。A.-32/3125B.32/3125C.-64/3125D.-l28/3125
[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