BC2+CE2 |
2 |
D′A2+D′E2 |
2 |
EF |
FB |
EC |
AB |
1 |
2 |
1 |
3 |
| ||
3 |
AE2+EF2 |
2+
|
2
| ||
3 |
FG |
FB |
D′E |
D′B |
2
| ||
9 |
FG |
AF |
| ||||
|
| ||
15 |
| ||
15 |
A.若a∥b,则α∥β | B.若α⊥β,则a⊥b |
C.若a,b相交,则α,β相交 | D.若α,β相交,则a,b相交 |
AEC |
AC |
5 |
6 |
2 |
3 |
2 |
3 |
A.若a∥α,b⊂α,则a∥b | B.若α⊥β,a⊂α,则a⊥β |
C.若a⊥α,α∥β,则a⊥β | D.若a⊥c,b⊥c,则a∥b |
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