hk11007

thx!!!!!!

likinnam

thx thx

danielleung123

seesee.....

zhcloveytt

很好了，不错。

mts812

thanks

mreten

Thanks

yip2007

好難呀．．．．

k.24

let me have a try

7191255

;lllllllli877777777777

iven888

thank's a lot !!!!!!

element_z

VPL-CS120

blueeye_dw

thnak you

andytplam

先把乒乓球分開"A", "B", "C" 3組; 每組4個...4 }7 ^# l9 q! T4 X6 L
再隨機抽2組秤第一次...& a0 m+ p+ d4 d
第1次結果: 如果秤上有任何一組輕了, 該組裡面其中一個球有問題; 如果兩邊天秤平衡, 那即是沒有放到秤上的球組有問題;
* O( F/ |1 ?/ F. y) v  J跟著, 把有問題的球組再分開2組, 每組2個秤第二次...
. s+ L# ?5 q' r' Q6 ]! a) Xtvb now,tvbnow,bttvb第2次結果: 比較輕的一組抽出, 分開(這時每邊祇有1個), 再秤第三次就能找出有問題的乒乓球了...

smallgunner

haha....easy la..
: E) o- M; n3 \ 1st ...measure 两边6个, then sure one side will more heavy, then seperate the six balls and measure 3balls each side for second times.then sure one side will more heavy. for the last measure is choose two balls to measure, if the weight is same mean then ball which is not choosen is the more heavy ball. understand