xf′(x)-f(x) |
x2 |
f(x) |
x |
A.(-2,0)∪(0,2) | B.(-∞,-2)∪(2,+∞) | C.(-2,0)∪(2,+∞) | D.(-∞,-2)∪(0,2) |
xf′(x)-f(x) |
x2 |
f(x) |
x |
f(x) |
x |
f(x) |
x |
f(2) |
2 |
f(-2) |
-2 |
f(x) |
x |
f(x) |
x |
A.y=sinx | B.y=x3 | C.y=ex | D.y=ln
|
1 |
x |
a |
x2+1 |
A.2 | B.1 | C.
| D.
|
|
A.(1)(2) | B.(2)(3) | C.(1)(3) | D.(1)(2)(3) |
2x2 |
x+1 |
A.[
| B.[4,+∞) | C.(0,
| D.[
|
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