lim |
k→0 |
f(x0+k)-f(x0) |
k |
A.2 | B.-2 | C.
| D.-
|
lim |
k→0 |
f(x0+k)-f(x0) |
k |
lim |
△x→0 |
f(x0+△x)-f(x0-△x) |
△x |
A.
| B.-
| C.2f"(x0) | D.-2f"(x0) |
π |
4 |
A.4πx+16y-π2=0 | B.4πx-16y-π2=0 |
C.4πx+8y-π2=0 | D.4πx-8y-π2=0 |
1 |
2 |
lim |
x→0 |
f(x+1)-f(1) |
2x |
A.
| B.3 | C.6 | D.无法确定 |
A.2m/s | B.3m/s | C.4m/s | D.5m/s |
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