y | ||
z
|
z | ||
y
|
y | ||
z
|
z | ||
y
|
y | ||
z
|
z | ||
y
|
1 | ||
|
1 |
4 |
1 |
2 |
1 |
4 |
1 |
2 |
1 |
2 |
1 |
2 |
1+x |
x |
1-x |
A.(-∞,-1] | B.[-1,+∞) | C.[-1,1)∪(1,+∞) | D.R |
A.f(x)=x2+3x+2 | B.f(x)=x2+x+
| C.f(x)=
| D.f(x)=
|
-3x+1 |
x-2 |
A.2 | B.-2 | C.-1 | D.-3 |
A.R | B.(-∞,0) | C.(-∞,1) | D.(0,+∞) |
1 |
2x+1 |
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