4 |
x |
1 |
y |
A.9 | B.
| C.7 | D.
|
4 |
x |
1 |
y |
4 |
x |
1 |
y |
x+y |
2 |
1 |
2 |
x |
2y |
2y |
x |
5 |
2 |
|
9 |
2 |
x |
2y |
2y |
x |
4 |
3 |
2 |
3 |
4 |
x |
1 |
y |
9 |
2 |
A.x,y>0时,
| B.
| ||||||||
C.lgx+
| D.a>0时,(a+1)(
|
1 |
x |
1 |
2y |
x2-2x+2 |
2x-2 |
A.1 | B.-1 | C.-2 | D.2 |
1 |
a |
A.有最小值2 | B.有最大值2 | C.有最小值-2 | D.有最大值-2 |
1 |
x |
1 |
y |
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