中二數學,超急
2009-03-02 7:05 pm
A和B正在玩大富翁遊戲.A說:「如果你給我一張地契,那麼我和你擁有的地契數目便會一樣.」B說:「還是你給我一張地契吧!那麼我擁有的地契數目便是你的兩倍了.」究竟他們各有多少地契呢？
回答 (4)
2009-03-02 7:11 pm
✔ 最佳答案
A說:「如果你給我一張地契,那麼我和你擁有的地契數目便會一樣.」 ===> a+1 = b-1
===> a = b-2 OR b = a+2
B說:「還是你給我一張地契吧!那麼我擁有的地契數目便是你的兩倍了.」
===> b+1 = 2(a-1)
===> a+2+1 = 2a-2
===> a+3 = 2a-2
===> a=5
b = 5+2 = 7
2009-03-08 6:57 pm
good!
2009-03-08 10:58:22 補充：
very good !!!!!!!!!!!!!
2009-03-08 10:58:22 補充：
very good !!!!!!!!!!!!!
2009-03-03 1:47 am
A+1=B-1------------------(1)
B+1=2(A-1)---------------(2)
A+1=B-1
A+3=B+1
B+1=A+3------------------(3)
(2)-(3)
0=2(A-1)-(A+3)
0=2A-2-A-3
0=A-5
A=5//
A+1=B-1
5+1=B-1
B=7//
B+1=2(A-1)---------------(2)
A+1=B-1
A+3=B+1
B+1=A+3------------------(3)
(2)-(3)
0=2(A-1)-(A+3)
0=2A-2-A-3
0=A-5
A=5//
A+1=B-1
5+1=B-1
B=7//
參考: 自己
2009-03-02 7:21 pm
A+1=B-1 (1)
A-1=2A=B (2)
Substitute (2) into (1)
A+1=2A-1 then A=2 (3)
Substitute (3) into (1)
2+1=B-1 then B=4
Therefore A=2 and B=4
A-1=2A=B (2)
Substitute (2) into (1)
A+1=2A-1 then A=2 (3)
Substitute (3) into (1)
2+1=B-1 then B=4
Therefore A=2 and B=4
收錄日期: 2021-04-19 13:38:56
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20090302000051KK00319