y2 |
a2 |
x2 |
b2 |
2 |
2 |
2 |
c |
a |
| ||
2 |
|
|
y2 |
4 |
x2 |
2 |
2 |
|
2 |
2 |
2 |
2 |
| ||
2 |
m2-4 |
4 |
1+2 |
3 |
(x1+x2)2-4x1x2 |
3 |
|
3 |
4-
|
|m| | ||
|
1 |
2 |
1 |
2 |
3 |
4-
|
|m| | ||
|
1 |
2 |
m2(4-
|
1 | ||
2
|
m2(8-m2) |
1 | ||
2
|
m2+(8-m2) |
2 |
2 |
2 |
2 |
2 |
x2 |
a2 |
y2 |
9 |
| ||
2 |
A.b是a,c的等差中项 | B.b是a,c的等比中项 |
C.2b是a,c的等差中项 | D.b是a,4c的等比中项 |
x2 |
a2 |
y2 |
b2 |
x2 |
a2 |
y2 |
b2 |
x2 |
a2 |
y2 |
b2 |
| ||
2 |
© 2017-2019 超级试练试题库,All Rights Reserved.