题目
题型:不详难度:来源:
a |
b |
c |
1 |
5 |
3 |
5 |
a |
b |
c |
a |
b |
c |
a |
b |
c |
a |
b |
c |
a |
b |
c |
a |
b |
c |
a |
b |
c |
a |
b |
c |
其中正确的个数是( )
A.1个 | B.2个 | C.3个 | D.4个 |
答案
a |
b |
c |
19 |
5 |
7 |
5 |
(
|
|
a |
b |
c |
9 |
5 |
23 |
5 |
|
(
|
|
由于 (
a |
b |
c |
1 |
5 |
3 |
5 |
a |
b |
c |
14 |
5 |
8 |
5 |
由于(
a |
b |
c |
19 |
5 |
7 |
5 |
361 |
25 |
49 |
25 |
82 |
5 |
a |
b |
c |
35 |
25 |
82 |
5 |
由于(
a |
b |
c |
c |
0 |
a |
b |
c |
a |
0 |
故选C.
核心考点
试题【已知a=(1,2,3),b=(3,0,-1),c=(-15,1,-35),给出下列等式:①|a+b+c|=|a-b-c|;②(a+b)•c=a•(b+c);③(】;主要考察你对平面向量数量积的运算等知识点的理解。[详细]
举一反三
a |
b |
a |
b |
a |
b |
a |
b |
A.2 | B.4 | C.2
| D.6 |
AB |
CA |
CB |
CA |
A.20 | B.-20 | C.20
| D.-20
|
a |
b |
a |
b |
a |
b |
a |
a |
b |