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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5 {) `+ Y. W7 W( T
8 `" l8 V2 C: Z0 i3 l! d) ~Group A: 1,2,3,4
) V# m' k, j$ e- d# C: I% uGroup B: 5,6,7,8
; J1 ~2 T5 X$ l+ C- x1 u; t4 mGroup C: 9,10,11,12
# S2 {2 t2 R! O. s1 QGroup D: 13
e2 T l* ]; S2 C0 R) ^" [. k8 E: G! ~. V6 _3 T J' }) Y# J4 h
Round 1$ D+ |# E* \1 E6 ]& x
Group A vs Group B: B4 i+ i9 f0 n3 F6 r2 `- R8 x
如A and B一樣, 即較輕一粒在Group C or D% P1 v# @3 p8 A7 l
0 r. T/ R2 M! j% I/ D/ G! X
Round 23 n9 W' [3 s9 w. N: ?1 T
再在Group C拆成:) y3 I4 T2 T$ r
Group Ca: 9,10
a+ e: V- [& N4 [' O9 [2 j% rGroup Cb: 11,12
3 q; `; |, Q$ z; O5 P然後再秤, 如一樣, 即13為較輕一粒.( a) }( I; T& }3 T- P% y
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如不同, 即較輕一組有一粒較輕波子在其中,
; n) l, M1 c2 Y/ \要再秤, Round 3, 之後便知答案.
7 K# p: D/ F. Z/ I
4 f7 Y4 {9 b8 D' I1 J0 Be.g. #1 假設10為較輕的一粒8 {1 N1 l: i5 Z3 z N- C0 N
Round 1" z8 S+ j; `: H9 m/ t
1,2,3,4 vs 5,6,7,8 = equal" }5 D/ |& t/ v. G5 ~4 Y( j
8 e& F6 Q9 B. x5 H" ?$ G5 Z
Round 2. ?9 T, G" c' n, k
9,10 vs 11,12 = 9,10 < 11,12, f# |( o; \3 [' n
/ L' S Y% r( }+ K! d' k( f+ q
Round 3- `, w5 `; _+ M3 R8 F6 t
9 vs 10 = 9 > 10
# |8 v2 ~% b; H2 Y0 V. t( |/ n& {" b7 U4 a; p
The answer is 10.
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e.g. #2 假設7為較輕的一粒/ I& o, P* ~/ D$ [
Round 1
, |! c9 K0 h- ]: C1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8
9 a2 b8 E2 z7 V0 Y4 P% K- n1 ~! \) Q/ g5 a6 q0 c$ t( R
Round 2
: T2 h6 m: v% _5,6 vs 7,8 = 5,6 > 7,85 H3 G/ u! t( A# T, m4 ^+ V8 I- Q
" I5 p- p# v# m+ \Round 3
3 S$ S; R1 J" R N- w4 u" j1 j7 vs 8 = 7 < 8
/ ~- ^# ]# H" z9 o7 ]$ H, q2 Z# ~$ `' s0 c: E8 E
The answer is 7.
d' Z) i( H K+ b ~, i5 k) X; ~ j$ i& I1 x; O+ s! T1 B2 [8 p
e.g. #3 假設13為較輕的一粒
, l5 b: E. d) T) ?8 d) t* L/ _Round 1
/ O) {9 d# y% J i' |# u1,2,3,4 vs 5,6,7,8 = equal c# T/ }3 {3 V1 r1 Z
5 o8 j8 Z" d4 b7 }$ L& p( K
Round 2
% W0 k/ v+ o( n" |7 q- L" F9,10 vs 11,12 = equal
# L) r1 c% e8 c
( a' F& |0 H- n6 r/ }No Round 34 s2 ~/ V& {( u) L$ l9 A
, w& \9 |1 [8 R' M6 B6 F1 j1 pThe answer is 13.
1 c5 g& D; Q7 c$ f
l9 b- Q; S, B+ o6 o唔知我答得正唔正確呢?!  ) X w4 A1 W+ i
: c/ L0 L% w$ S7 D$ K- M- k[ 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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