xf′(x)-f(x) |
x2 |
A.(-2,0)∪(2,+∞) | B.(-2,0)∪(0,2) | C.(-∞,-2)∪(2,+∞) | D.(-∞,-2)∪(0,2) |
xf′(x)-f(x) |
x2 |
f(x) |
x |
f(x) |
x |
A.-x2+x+1 | B.-x2+x-1 | C.-x2-x+1 | D.-x2-x-1 |
A.(
| B.(0,
| C.(
| D.(0,1)∪(10,+∞) |
A.0 | B.1 | C.2 | D.3 |
1 |
x |
A.m<0 | B.m≤0 | C.m≤-1 | D.m<-1 |
A.y=x | B.y=-x3 | C.y=
| D.y=(
|
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