b2 |
a2 |
b2 |
a2 |
a2+b2 |
a2+b2 |
1 |
4 |
5 |
3 |
a2-b2 |
a2-b2 |
. |
MF1 |
. |
MF2 |
| ||
2 |
y |
x+a |
y |
x-a |
y |
x+a |
y |
x-a |
b2 |
a2 |
x2 |
a2 |
y2 |
b2 |
b2 |
a2 |
x2 |
a2 |
y2 |
b2 |
x2 |
a2 |
y2 |
b2 |
1 |
4 |
2 |
3 |
8 |
3 |
2 |
3 |
8 |
3 |
c |
a |
5 |
3 |
5 |
3 |
. |
MF1 |
. |
MF2 |
c |
a |
| ||
2 |
1-x |
x+3 |
2 |
2 |
3 |
3 |
2 |
A.若a⊥m,a⊥n,m⊂α,n⊂α,则a⊥α |
B.若a∥b,b⊂α,则a∥α |
C.若a⊂β,b⊂β,a∥α,b∥α,则β∥α |
D.若α∥β,α∩γ=a,β∩γ=b则a∥b |
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