a |
b |
2 |
a |
b |
a |
b |
a |
b |
a |
b |
a |
a |
b |
a |
b |
a |
b |
2 |
2 |
a |
b |
a |
b |
2 |
2 |
a |
b |
2 |
a |
b |
a |
a |
b |
a |
a |
a |
b |
a |
a |
a |
b |
a |
b |
2 |
2 |
2 |
| ||
2 |
a |
b |
π |
4 |
a |
m |
b |
m |
b |
AP2 |
CP2 |
BP2 |
DP2 |
A.梯形 | B.菱形 | C.矩形 | D.正方形 |
a |
b |
π |
3 |
a |
b |
a |
b |
A.λ=-
| B.λ=-
| ||||||||||||
C.λ=-1或λ=1 | D.λ为任意实数 |
e1 |
e2 |
a |
e1 |
e2 |
b |
e1 |
e2 |
a, |
b |
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