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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
# S: u- Q7 h+ j
: Z: r3 z' ?/ f/ j4 d# U* HGroup A: 1,2,3,4
* j7 k4 i1 G$ q% M. f( \4 L* _6 gGroup B: 5,6,7,8
4 B1 P6 R; j F+ }$ `8 m/ nGroup C: 9,10,11,12; X7 r7 Q$ Q' p2 \: O; l
Group D: 13
# G- j/ S% ?+ N! p
9 Q+ a- T- w. y5 a6 pRound 1& V( J$ ^& ~4 L+ `0 p
Group A vs Group B* U7 O- Q) c/ w: ]- ~+ z2 P
如A and B一樣, 即較輕一粒在Group C or D- ]2 Q! e3 Z/ |. J- d" g0 a
7 ]6 ^4 a: X3 |; t0 s" c$ ]! L
Round 28 Y$ q, W* [# g, _$ l
再在Group C拆成:
p5 ]) w n2 I$ ^Group Ca: 9,10( e% Z+ ~3 u2 L3 T' g$ {
Group Cb: 11,12" Z8 |; L" C8 w$ f2 C
然後再秤, 如一樣, 即13為較輕一粒.
" Y/ N [* d7 m. Q/ U
8 O$ B" @- E) Z/ Z' }/ B% ~( X+ l* ?% c如不同, 即較輕一組有一粒較輕波子在其中, ! i b! \* x% W& M
要再秤, Round 3, 之後便知答案.
5 m& m8 ^3 v7 k3 o
5 Z3 z6 _: C- Y2 ^e.g. #1 假設10為較輕的一粒0 N. x9 L0 K. h: k% e4 e" u# g: c
Round 1
; W0 _1 B+ x7 \2 j6 e, ~% O1,2,3,4 vs 5,6,7,8 = equal
r- u( v" Z" S) o* K; f( J8 v6 J3 g% H
Round 2
) n) V/ x, h6 L9,10 vs 11,12 = 9,10 < 11,12. d1 Y! G5 m) x5 |0 {; u
1 u: Q/ g4 b5 i! m6 {& ZRound 3
4 t) p) ?( ?; T* s9 vs 10 = 9 > 10
5 V% ^* I7 k- Y. z4 b/ _$ u5 q+ W9 ^' k5 Q% S! _
The answer is 10.
2 Q5 j3 n8 C" z$ S
! ~& T3 g( _: i( u2 re.g. #2 假設7為較輕的一粒
. i4 K& v5 ~( k; [1 B: H. Z1 T& h. |Round 1' g: ^( `* ~5 Q) x7 E5 W/ W
1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8' H0 F6 d% N( \' X& b, S% j
( I: ^4 n- Q: ]7 b' MRound 2
0 {) Q# `" y+ R! `% I1 `5,6 vs 7,8 = 5,6 > 7,8: ]" t. n- T6 J1 |( j+ A) G
1 m0 K7 X) u' S+ F+ o# vRound 3. \* A W/ H) [9 t n
7 vs 8 = 7 < 8% m) `5 P7 w% I4 E& i0 P/ S
6 [, X/ l0 |9 N% m, _
The answer is 7.
% s& z# `7 F; W) e- p/ @# w5 I7 [# f5 Y3 ^
e.g. #3 假設13為較輕的一粒
2 H. x K" @+ U! V8 ?) fRound 14 p+ W; P; T9 O# v1 E( {5 _
1,2,3,4 vs 5,6,7,8 = equal3 ?$ \! n0 R( g: V! i7 ]
7 w. F2 q* G9 y( T4 U# E2 s
Round 2
; T; P8 l2 Y7 ?2 I" F% A: J9,10 vs 11,12 = equal
$ @; a" v2 j& F6 o6 h$ P7 ?" I, @& N, u; Q5 `2 W' {% x$ I D/ G
No Round 3; Q" E2 h1 |3 B% c! d* i
% l. y# r) u7 P+ w# |The answer is 13., ^, D/ d4 s5 J4 s7 E! X
0 x; y `, m4 X) o9 {- v! L. P唔知我答得正唔正確呢?! 
7 A- G3 k$ O6 L$ Y8 z' h8 F; n" B3 }
[ Last edited by hello1997 on 2007-3-2 at 12:39 AM ] |
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