A.(7,10);(n+4,2n+4) | ||||
B.(10,13);(
| ||||
C.(10,13);(
| ||||
D.(8,11);(
|
(n-1)(2+n) |
2 |
(n-1)(2+n) |
2 |
n2+n+10 |
2 |
n2-n+10 |
2 |
n2-n+10 |
2 |
n2+n+10 |
2 |
A.0个 | B.1个 | C.0个或1个 | D.至少2个 |
1 |
x-3 |
x |
A.f:x→3x | B.f:x→x2 | C.f:x→±
| D.f:x→2.5 |
lnx |
x2 |
ln1 |
14 |
ln2 |
24 |
ln3 |
34 |
lnn |
n4 |
1 |
2e |
A.{(x,y)|y≥x2} | B.{(x,y)|
| |||||
C.{(x,y)|x2+y2-2y≥0} | D.{(x,y)|3x2+2y2-12<0} |
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