AB |
AC |
AB |
AB |
(-1)2+22 |
5 |
AC |
AC |
22+12 |
5 |
AB |
AC |
AB |
AC |
1 |
2 |
AB |
AC |
5 |
2 |
5 |
2 |
3 |
OA |
OB |
A.
| B.-
| C.
| D.-
|
a |
b |
a |
b |
c |
a |
c |
b |
c |
c |
A.2 | B.1 | C.
| D.4 |
A.(a+b)⊥(a-b) |
B.a与b的夹角等于α-β |
C.|a+b|+|a-b|>2 |
D.a与b在a+b方向上的投影相等 |
a |
b |
a |
b |
π |
2 |
AP |
BC |
A.8 | B.6 | C.4 | D.2 |
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