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9#
發表於 2007-3-2 12:35 AM
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分3組4隻波子秤
: `; Z( e& w. `! t: i/ }/ A
/ y2 u+ R3 m+ R% f7 E4 d! lGroup A: 1,2,3,4* i2 F5 }) ^$ D
Group B: 5,6,7,86 y. p u7 c4 x' l( t I4 c
Group C: 9,10,11,12
5 `0 G6 A3 F' F3 c" \Group D: 13
0 f4 }- e0 _0 V2 V4 p# }
$ E0 D0 m# t$ ]3 j. d* b0 lRound 1! {9 k7 {9 e/ z& Z' O# y" E
Group A vs Group B
4 g0 Y9 o. J5 ~ E如A and B一樣, 即較輕一粒在Group C or D; b3 s E: T, I' W1 Z
& |8 J2 t* g) }) N" ~4 v% n6 W: @
Round 2
& `6 d, ?( o& y& N. r, u! S1 ~- R# ~再在Group C拆成:
' ^8 l7 b& r! S- U dGroup Ca: 9,10# P6 _, a1 r* H9 w# w
Group Cb: 11,123 N) T# |% Z5 q% H
然後再秤, 如一樣, 即13為較輕一粒.
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如不同, 即較輕一組有一粒較輕波子在其中,
% ]9 B7 n, @! G+ e6 q要再秤, Round 3, 之後便知答案." v7 G4 N! ?0 L* f5 w U9 H: d
3 a- a' v$ [) He.g. #1 假設10為較輕的一粒; ?7 p$ [5 o, Z3 g8 K/ r
Round 1
- X* T) o) f" c3 n5 U, j- e E1,2,3,4 vs 5,6,7,8 = equal
" r2 E/ v* j4 O/ v g- o/ j% t% A9 F6 C1 ?
Round 2
2 C5 q. f& r7 g9 P! r( I; C- h9,10 vs 11,12 = 9,10 < 11,123 E, Q8 M8 R% b( p
. \) @1 _; ?' p! O
Round 3
: J+ N- D4 x, ^" R9 vs 10 = 9 > 108 n1 ^/ \$ m0 R7 t( ~! Y9 D; [
& m- J5 k% c. S6 G" AThe answer is 10.& _# [" p: J* R* {
, r, U! N/ Y* {0 I, je.g. #2 假設7為較輕的一粒
z3 A5 X0 v3 @% t/ {, SRound 1
- ~! { m K2 c' J1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,89 w9 Y5 [* Z5 D% t% F/ g f
* E9 t0 L! s9 P, u
Round 2
( K" d( l& O2 ?4 `/ }7 i5,6 vs 7,8 = 5,6 > 7,8" k* d. P& i: V9 r+ c
3 q( F' y& Q; k9 jRound 3" s7 h5 ]1 H, ]9 E, u+ P6 `
7 vs 8 = 7 < 8
# [( i. ?. {9 y+ |6 m' E. Z
: ]* a$ N6 Y |- |The answer is 7.: n# m/ X) ?* ^) l8 s ]$ M
. D8 R3 f0 {6 O% d0 M8 c$ k& g
e.g. #3 假設13為較輕的一粒
( B; R2 I" W! ]' W6 E. i5 FRound 1
$ a3 h9 L. x* }7 z1,2,3,4 vs 5,6,7,8 = equal
+ f4 K* {7 M: S9 T7 F
4 R0 Y! b' X& ?" c3 C) e: dRound 2( p @0 z' \6 k# U1 s4 B* Y q1 s
9,10 vs 11,12 = equal
( X: X$ C" H) T" ]$ B. b$ Z7 | i/ P6 J: m" |( I z1 x- C% C
No Round 3
9 g) P5 v' T0 I! h6 ?0 ]) P
" H/ Y- Y$ w. U& P! UThe answer is 13.& t3 B; z: a- z# I
% p' E6 t( _5 M, ?1 `
唔知我答得正唔正確呢?! 
) a H7 ]' s; i$ H, l2 ^' v0 m- }2 v/ W: v6 B
[ Last edited by hello1997 on 2007-3-2 at 12:39 AM ] |
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