

1、单选题:
find
the specific function values

选项:
A: (a)0 (b)0 (c)58(d)33
B: (a)0 (b)0 (c)55(d)36
C: (a)0 (b)7(c)56(d)33
D: (a)2(b)0 (c)56(d)33
答案: 【 (a)0 (b)0 (c)58(d)33】
2、单选题:
Find the limit

选项:
A: 1
B: -1
C: 0
D: 1/2
答案: 【 1】
3、单选题:
At
what points (x, y, z) in space is the function continuous?
选项:
A: 
B: 
C: 
D: 
答案: 【 
】
4、单选题:
find
the limit of ƒ

选项:
A: 
B: 
C: 
D: 
答案: 【
】
5、单选题:
Find
all the second-order partial derivatives of the function
选项:
A:





B:





C:





D: 




答案: 【





】
6、单选题:
find
the directions in which the functions increase and decrease most rapidly at P,
Then find the derivatives of the functions in this direction.

选项:
A: 



B: 



C: 



D: 



答案: 【 


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