AD |
AB |
CO |
A.(-
| B.(-
| C.(
| D.(
|
AD |
AB |
AC |
AB |
AD |
CO |
1 |
2 |
AC |
1 |
2 |
AB |
A.(5,5) | B.(-5,-5) | C.(1,3) | D.(-5,5) |
a |
b |
a |
b |
A.(-4,-3) | B.(-4,-1) | C.(0,-3) | D.(0,-1) |
P1P |
PP2 |
A.(7,2) | B.(-7,-2) | C.(-4,-2) | D.(4,2) |
AB |
a |
a |
A.(1,
| B.(2,1) | C.(-1,2) | D.(-4,-8) |
a |
b |
1 |
4 |
a |
b |
A.30° | B.45° | C.60° | D.30°或60° |
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