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發表於 2007-3-2 12:35 AM
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分3組4隻波子秤
3 H; R. ^5 f0 M0 d$ O; n5 e: U+ J% S/ T( H2 P4 D( d
Group A: 1,2,3,43 R3 k* P1 d* p% M5 L$ |7 H. O
Group B: 5,6,7,8
9 @( i; j) n1 ~4 C6 x1 E, |5 UGroup C: 9,10,11,12, q: M2 U0 c3 j2 U4 I9 c
Group D: 13) }5 [- N; `0 k; ^, m
2 l* _" J2 r. S7 E, u9 P9 O" a
Round 1
% n2 ~) t, o1 w: Q+ @3 l* V MGroup A vs Group B9 ?) u3 n% N% o0 `% m
如A and B一樣, 即較輕一粒在Group C or D
7 ]# `2 m/ f( g- e$ ?- @" K: E5 V1 H, C' ^* t4 S6 N
Round 2
. { O5 y% p9 f% s# w再在Group C拆成:6 t. ]2 R. Y' I7 S
Group Ca: 9,10
3 t e# n" e( `: q6 q5 l+ R& gGroup Cb: 11,12
+ m( d# ~( q1 l3 V然後再秤, 如一樣, 即13為較輕一粒.1 P) C+ }. x7 W) t" {% z5 @% c2 }
! v# u. L% B) G% W% a- A
如不同, 即較輕一組有一粒較輕波子在其中, + R: C5 ^% j; C
要再秤, Round 3, 之後便知答案.: |* A( i; _* | @2 m: I! Y3 n2 y
6 y! f: Q4 k4 g' f& S
e.g. #1 假設10為較輕的一粒1 R K( {$ t7 s4 v
Round 19 P% }' v% r* ]4 m0 W2 S2 p2 r* E% ?
1,2,3,4 vs 5,6,7,8 = equal
M* h7 F" v9 B' C" E* T0 X4 M3 O$ F# U: U9 k" L( U3 @- W
Round 2
% s9 r* o4 t$ e2 G3 ?1 |9,10 vs 11,12 = 9,10 < 11,12
. m- N8 L8 k' j' r& F9 Q$ D" T3 O4 l' l, S/ q
Round 3- j* t! t8 \$ Y+ G- v# }6 R
9 vs 10 = 9 > 10, h6 H/ E! Z- a* |' n
5 E( y1 D; b4 ~/ k' F7 B% z4 xThe answer is 10.4 T% V/ U: h0 r5 }; c$ S
: ~% S+ `1 V& T" h* h( Z# ?
e.g. #2 假設7為較輕的一粒% a4 m g3 q5 L( Q. [: n N
Round 1
5 f9 Y' E1 k* q( K% g: }% [1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8
2 v- c/ S% M4 m! G7 ?8 T) \1 j* e: u1 u4 C. D5 X7 T4 }
Round 2
( o- g! H |2 C% \$ R5,6 vs 7,8 = 5,6 > 7,8
) s4 U& y! h1 ]. x1 w! V3 L' L! A5 d- C8 g! B9 | }3 P4 }2 h% K
Round 3
V6 _- H4 l7 V0 L7 vs 8 = 7 < 8
4 m) m( @/ U! w/ r* A8 E& R; f! k) I+ L4 v- D) J8 p
The answer is 7.
6 L+ }/ Y. H/ f5 H$ A6 ^; |: r) ]4 R) |# ~
e.g. #3 假設13為較輕的一粒
# I5 V K, ~: `5 Y0 }, [, ^* mRound 1: M/ {+ ~9 m! E, z7 |+ c& k- ?5 `
1,2,3,4 vs 5,6,7,8 = equal
& p+ B. l m' L' X6 f
! z1 c% }/ t( Y# qRound 2
! \# F! A2 V0 k: o1 u) a! R9,10 vs 11,12 = equal
: G/ Y& H+ y6 [
4 ?1 h1 H* Q' q, g9 O: i7 p! ]3 N7 m. RNo Round 3' }3 f% F0 [, m- l5 w
" `, O: t3 o' p/ F. R+ G3 h4 sThe answer is 13.9 w- \& E: |% W8 D0 I) } @, ?" i% O
C) C- c% {. I" b3 m
唔知我答得正唔正確呢?! N5 _' ~4 t" U* @1 r( N
1 O) r3 e' v' S
[ Last edited by hello1997 on 2007-3-2 at 12:39 AM ] |
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