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Li Mengyuan 13122687 Xu Junjie 13122364 Geng Yong 13123949 Ma Yinxiang 13121754.

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Presentation on theme: "Li Mengyuan 13122687 Xu Junjie 13122364 Geng Yong 13123949 Ma Yinxiang 13121754."— Presentation transcript:

1 Li Mengyuan Xu Junjie Geng Yong Ma Yinxiang

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3 He won 8 million lottery. He is A’s good friend.

4 1. a > b, A will give B the money a. 2. b > a, A will give B the money (b-a)/a. 3. a = b, A will give B the money (a+b).

5 There are some interesting things. What should they give figures to make to maximize their own interests ? ?

6 The number of B 8million ( ) 4million-8million ( ) 4million ( ) 10w-4million ( ) 10w ( ) 1w-10w ( ) 1w ( ) VOTE 2.Analyze simply.

7 If you vote for 8 million. You maybe right in 2 cases. Case 1 : A is a rich man. He didn’t care about the money. Case 2 : A want to give you a test, so he would choose 8 million.

8 Then, let’s think about the case that is different from the above 2 cases. So which number is best? ?

9 For A: From 1 to Ok , It’s time to slove the problem. For example : a=50

10 For A: From 1 to

11 Plus all the situations, we get the final formula:

12 For B: From 1 to For example : b=

13 For A: From 1 to For example : b= (b+1) (b+2)

14 Also , plus all the situations we get the final formula:

15 Derivative !!! a ∈【 1 , 】 S’(a)>0 So, the function is always increasing. And for A, at 1 will has the minimum expense. We have written down the function S(a) and S(b),but how to deal with them ?

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