only calculate front 輪胎,後輪的壽命easy to get,but definition not clea

來源: 於 2010-08-21 22:54:48 [舊帖] [給我悄悄話] 本文已被閱讀：次

前輪的壽命為四萬公裏,1萬公裏cut 1/4
後輪的壽命為六萬公裏,1萬公裏cut 1/6
we have:1/4+1/6+1/4+1/6+x/4=1,x=2/3,mean 4(2/3)萬公裏.
前輪的壽命為四萬公裏,0.5萬公裏cut 1/8
後輪的壽命為六萬公裏,0.5萬公裏cut 1/12
1/8+1/12+1/8+1/12+1/8+1/12+1/8+1/12+1/8+x/12=1
x=1/2 mean (9+1/2)*5000=47500公裏
the limit is 2/(1/4+1/6)=4.8萬公裏.