x2+5 | ||
|
A.2 | B.
| C.1 | D.不存在 |
x2+5 | ||
|
(
| ||
|
x2+4 |
1 | ||
|
x2+4 |
1 |
t |
x2+5 | ||
|
5 |
2 |
A.m<
| B.m<
| C.0<m<
| D.m>
|
A.(-2,2] | B.[-2,2] | C.(2,+∞) | D.(-∞,2] |
b+3 |
a-2 |
A.(-
| B.(-∞,-
| ||||
C.(-
| D.(-∞,-
|
A.0 | B.-4 | C.-2 | D.2 |
a2 |
x |
b2 |
y |
(a+b)2 |
x+y |
a |
x |
b |
y |
2 |
x |
9 |
1-2x |
1 |
2 |
A.11+6
| B.11+6
| C.5,
| D.25,
|
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