第二章单元测试
- Suppose that
is differentiable at 
，
. Then
is （ ） for the differentiability of
at 
. If
, then
=（ ）。- Let
. We have 
, and 
. Then 
（ ）。 - Suppose that
is determined implicitly by 
. Then
=（ ）。 
A:a sufficient but not a necessary condition B:a necessary but not a sufficient condition C:a necessary and sufficient condition D:none of the above
答案:a necessary and sufficient condition
A:-2 B:2 C:-6 D:6
答案:6
A:1 B:does not exist C:3 D:0
答案:0
A:
B:
C:
D:
答案:
A:
B:
C:
D:
答案:
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