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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
1 r# d, o5 L/ {, \' n
' q, ?7 P P8 |( V( ~& eGroup A: 1,2,3,4
4 [6 B8 Q$ d! N: a( rGroup B: 5,6,7,8
* a8 [# l# L9 N3 m9 \$ R0 vGroup C: 9,10,11,12
9 s% |0 r8 _( u& s4 e$ [' X$ E% CGroup D: 13: p3 B' q) p5 X, q) i
+ ^( }2 b. Y5 s" |
Round 11 b' ^* o5 R# D+ k" X
Group A vs Group B2 w$ i8 D# z) y# t9 {1 j" g5 {
如A and B一樣, 即較輕一粒在Group C or D
0 B# W+ q. L' I- @1 g9 y. y) B8 m8 D/ T* x6 n0 t" p: j/ D, n
Round 2
C( Y, d2 h4 R- w7 |' B再在Group C拆成:2 C& h& f4 O* \6 J- i' H/ I
Group Ca: 9,10
* G4 w6 i5 @5 v) e" B& KGroup Cb: 11,12
* W1 T2 P" d6 b, _( ~然後再秤, 如一樣, 即13為較輕一粒.& Q# Y: ~4 o m# H# e- }5 Y5 f' ^$ p- n
2 y7 l9 h6 ^# G如不同, 即較輕一組有一粒較輕波子在其中,
& B6 B% G" `$ d% B6 A要再秤, Round 3, 之後便知答案.
/ g" x$ G* B# N; r9 j1 z! b2 g4 B: B6 e
e.g. #1 假設10為較輕的一粒
* r! \& o1 l [* D" o. c8 f, dRound 1, D$ f+ H6 A4 M. Z8 {
1,2,3,4 vs 5,6,7,8 = equal
# A5 N) V( G r. v; p& y+ P& S
) M5 Z( k: d$ U0 j1 ?Round 2
5 y; ^* X$ `8 m7 S. a$ B9,10 vs 11,12 = 9,10 < 11,12
6 q9 H% g! K6 C# P' A3 X5 D7 V" S' E6 K8 l% g$ J: Q$ y! H
Round 36 d$ }8 f- {) p1 {9 X
9 vs 10 = 9 > 10
' |9 {0 {' {+ c4 b' E# C
# P$ K3 o5 M; ]. I$ a/ v! kThe answer is 10.9 _2 [; R" Q4 h; Q, X- g' f( F
8 _' q8 Z( c: C- Q8 u2 E* Q
e.g. #2 假設7為較輕的一粒
# F2 |6 b, H2 G# m4 X1 ~Round 1+ Q: O# w9 }( {# _& K
1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,88 r& i5 y: n9 v! o) o9 `
S/ q8 k/ W. r" A; D$ ARound 2
# r7 V3 I0 ^- X" r6 R3 h5,6 vs 7,8 = 5,6 > 7,83 N3 Y' g. g. B3 J# G8 @
. h5 L4 Z8 \# _Round 3, f3 }; A$ m; d) l* I$ I+ o
7 vs 8 = 7 < 8
- a6 p# h' N3 e' P+ x" E6 {/ |: H0 h3 H; x. g5 |. E$ B& u& ~$ y
The answer is 7.
2 h# s+ K$ E% r9 e0 q0 r, _1 I- a5 ^- b" L; T+ s
e.g. #3 假設13為較輕的一粒$ x- E0 X: P/ s( u) O
Round 1( ~/ `3 v3 [' v% m3 l' ~, Y" H
1,2,3,4 vs 5,6,7,8 = equal3 \/ }* O. T: h; {; K1 B
1 O9 t4 C1 s) Q3 m, H9 @
Round 2
f" \2 s( n# G$ f' V/ @9,10 vs 11,12 = equal4 ^8 K' a1 ~# f2 p
& \! W: V# M1 v! e Z+ ^) _% [
No Round 3
/ w9 f$ `1 G" e, y/ D2 X6 B0 p7 R3 _- b% L) f7 P
The answer is 13.1 z3 Z& }4 R: o
/ R+ L3 \; t K# p1 H+ N唔知我答得正唔正確呢?!  # p3 k9 g6 s9 M
3 a, A1 |1 x- B0 U6 A[ Last edited by hello1997 on 2007-3-2 at 12:39 AM ] |
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發表於 2007-3-1 11:57 PM
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