x |
a |
y |
b |
x |
λ |
y | ||
|
2
| ||
5 |
A.
| B.
| C.2
| D.
|
x |
λ |
y | ||
|
3 |
2
| ||
5 |
2
| ||
5 |
λ |
h |
| ||
2 |
AC2+BC2-AB2 |
2AC•BC |
1 | ||
2
|
1-cos2C |
| ||
2
|
1 |
2 |
| ||
2 |
1 |
2 |
1+λ2 |
| ||
2
|
3 |
A.甲 | B.乙 | C.丙 | D.丁 |
AC |
BC |
AE |
BE |
AC |
BC |
AC•EG |
BC•EH |
S△AEC |
S△BEC |
AE |
BE |
AE•CF |
BE•CF |
S△AEC |
S△BEC |
AC |
BC |
AE |
BE |
1 | ||
2x+
|
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