✔ 最佳答案
sol
设a/b=b/c=c/d=d/a=k
a=bk
b=ck
c=dk
d=ak
相加
(a+b+c+d)=k(a+b+c+d)
(a+b+c+d)(k-1)=0
若a+b+c+d=0
则(a+b+c+d)/(a+b+c-d)=0
若k-1=0,k=1
则由a=bk
b=ck
c=dk
d=ak
得a=b=c=d
则(a+b+c+d)/(a+b+c-d)
=(a+a+a+a)/(a+a+a-a)
=4a/2a
=2
2011-02-27 21:24:29 補充:
◎ *TONY CHEUNG * ◎™ ( 碩士級 2 級 ):
you may right if a=0,but a/b is equil to inf. ...
2011-03-02 06:57:42 補充:
*例行提醒
請勿在得到答案後移除問題
2011-03-06 22:40:06 補充:
is m1 or m2?
2011-03-06 23:03:06 補充:
so you del by urself or...
2011-03-06 23:57:04 補充:
give me id card!