A . 1/65
B . 1/32
C . 1/56
D . 1/48
[单选题]1/9,1/28,( ),1/126A.1/55B.1/54C.1/65D.1/75
[单选题]:1,2/3,5/9,1/2,7/15,4/9,( )。A.5/9B.3/5C.2/13D.3/7
[单选题]:9,1,( ),9,25,49。A.1B.2C.4D.5
(-2,1] D. (-2,1)
[单选题]1/3,1/7,7/9,1/31.19/45,()A . 11/21B . 13/51C . 63/65D . 91/165
[单选题]1/2,1/2,1/2,7/16,11/32,( )A.15/64B.1/4C.13/48D.1/3
通过点_(1)(1,-5,1) _(2)(2,1,-2)且与_(1)(1,-5,1) _(2)(2,1,-2)轴平行的平面方程为A._(1)(1,-5,1) _
[主观题]-1/7,1/7,1/8,-1/4,-1/9,1/3,1/10,()A.-2/5;B.2/5;C.1/12;D.5/8;
[单选题]-1/7,1/7,1/8,-1/4,-1/9,1/3,1/10,()A . -2/5B . 2/5C . 1/12D . 5/8
[单选题]2,1,-1,1,12,( )。A.26B.37C.19D.48