a |
3 |
b |
1 |
2 |
| ||
2 |
a |
b |
x |
a |
b |
y |
a |
b |
x |
y |
a |
b |
| ||
2 |
| ||
2 |
a |
b |
a |
b |
a |
b |
x |
y |
a |
b |
t2-t-5 |
t+2 |
t2-t-5 |
t+2 |
1 |
t+2 |
1 |
t+2 |
1 |
2 |
A.y=kx(k<0)是增函数 | ||
B.y=x2是R上的增函数 | ||
C.y=
| ||
D.y=2x2(x=1,2,3,4,5)是增函数 |
|
|
A.(-∞,-
| B.( 1,
| C.[-
| D.[
|
A.(-∞,-2)∪(0,2) | B.(-2,0)∪(2,+∞) | C.(-2,2) | D.(-2,0)∪(0,2) |
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