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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 ?' q4 I6 p6 f4 X. y2 a$ G1 c5 M: @/ Q) d/ P
Group A: 1,2,3,4
* j8 f( N! s% kGroup B: 5,6,7,83 {0 d" l+ c* `# B
Group C: 9,10,11,123 R ~- u. t7 K& ]/ d: O+ m3 ^
Group D: 13
0 O# ?% S1 Z( U: c4 ~* I* q% P( r* _6 h; B5 i. p
Round 1
4 Z6 f' l, h9 R8 SGroup A vs Group B
7 n {$ D: \) @# }6 X如A and B一樣, 即較輕一粒在Group C or D
& f% T, T, D* E4 i
; B# n* }' v) ~8 ?. CRound 26 G$ j( `2 {, @. ]' @/ k" Z$ W0 M
再在Group C拆成:2 ?5 `/ v+ y; o: Q$ B7 T& a
Group Ca: 9,10
/ L8 c) V$ {9 F( k1 C4 M8 hGroup Cb: 11,12, {# G1 Q/ X# X+ O9 Q( d) Q$ T6 Z; ]4 R
然後再秤, 如一樣, 即13為較輕一粒.
: }5 A: l4 D7 x6 C& i- ]
1 M, ]1 S' {4 D0 E如不同, 即較輕一組有一粒較輕波子在其中, 8 J1 ~! W6 \0 i0 V6 N) O
要再秤, Round 3, 之後便知答案.6 L9 S& Z* `! @& o2 N, f7 O# E+ n
3 C6 I ?0 Z- K& q! u7 f& h2 q
e.g. #1 假設10為較輕的一粒
3 D- B3 b3 G7 b# Q# w5 v9 HRound 11 C2 x V4 x' f1 a
1,2,3,4 vs 5,6,7,8 = equal. c% H+ k9 H: k* K) G
" ~% t$ q: F! I+ P, y: S* d
Round 2
* w5 z! K f7 @9 W0 u+ U7 T9,10 vs 11,12 = 9,10 < 11,121 `4 y6 _, T5 Y8 ]. ]& o
; e3 e- o& @: k" c# H* D1 |Round 3
# u) s ?$ u: L, a' |# j9 vs 10 = 9 > 10
: G3 z4 i$ y: L, w- V: v) M7 p2 f" q: s
7 n3 A: L; S' Q) zThe answer is 10./ q' B9 ^2 c7 S) _* ]2 s; t0 {8 q
, m* l& c7 S3 S, v+ N! b* \" H: Ye.g. #2 假設7為較輕的一粒
3 g4 W2 _2 o+ @8 L3 Y7 @. ]Round 15 B" x U" Z9 c% A
1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8) J6 |' A, z4 e2 S
5 C! I* B. d8 P4 \
Round 2
2 l8 q" ?/ n$ b( W& y( {" P5,6 vs 7,8 = 5,6 > 7,8
7 w5 O* C5 } {3 J. h3 z7 p4 T8 V8 f
Round 3
B4 q$ L; @7 D7 vs 8 = 7 < 8
1 j$ [7 X! F: l3 z) |
& a% C+ P K; p! [The answer is 7.
' H" m2 p; E8 o! H) C
* C( s0 B0 j6 s( J* s$ Se.g. #3 假設13為較輕的一粒7 t% g, o2 { h, u9 u4 k
Round 1
) b7 B. G' N. ]; g1,2,3,4 vs 5,6,7,8 = equal
8 k1 n; d+ L( R' T1 A
_ b% u% g; ~# d/ s2 IRound 2
5 e' P: Z+ b8 l% X! r/ r9,10 vs 11,12 = equal! M% o, S8 o" o; \/ R% i0 t
& D8 u3 t, B- d4 [2 M& y" GNo Round 3 g L1 u2 u3 J; L( r
4 r( ?! R P( d
The answer is 13.
4 o( Y2 ~" m; O5 G7 S1 H
- x( T2 C7 a( _唔知我答得正唔正確呢?! 
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' _ f, a# X; E. }3 T- i[ Last edited by hello1997 on 2007-3-2 at 12:39 AM ] |
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