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9#
發表於 2007-3-2 12:35 AM
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分3組4隻波子秤6 l9 u2 k I! m5 D/ c2 M
& h/ W, X7 A% Z9 b
Group A: 1,2,3,4
5 v) z/ F$ [& c: l gGroup B: 5,6,7,8
8 E5 E" \- @9 B; X+ l; DGroup C: 9,10,11,12- F9 M5 O ]$ D: p
Group D: 13* R: @5 S% x' w( H/ V
' y5 ^( h7 v L) ~
Round 1
/ |9 {0 E1 y6 L* C: z1 VGroup A vs Group B
# |! \7 c. a8 I# t如A and B一樣, 即較輕一粒在Group C or D7 u0 R# Y7 }; @7 `3 [, z
0 v& ~. p8 x* z" `$ HRound 24 Q: M& ]" v/ D
再在Group C拆成:( f5 |& B' d5 H8 H8 j+ Y8 g1 n; P
Group Ca: 9,10' C5 o5 ^5 |$ G5 k+ Z# V
Group Cb: 11,129 u& U% n* l! Y8 [) Q4 x
然後再秤, 如一樣, 即13為較輕一粒.
2 A! \% X' t# Q A+ ]% O! c0 ~$ B, \! p
如不同, 即較輕一組有一粒較輕波子在其中,
4 W% u: v) v( J5 a1 D8 i+ K要再秤, Round 3, 之後便知答案.
3 ^; q' {' l' G: N8 E% Y2 a
/ {/ h: R" e* @& l9 l+ xe.g. #1 假設10為較輕的一粒
. h6 h& E6 t# V# ^# bRound 1* `' n! f1 M8 j6 X( J# Q' {) \, |4 B# q
1,2,3,4 vs 5,6,7,8 = equal0 J# H8 X2 U) |5 M h; v
" s& }4 n2 x. i e- @
Round 2
, V! y! i2 Z; {1 `. @3 m9,10 vs 11,12 = 9,10 < 11,12% f/ I- J% v( i1 j3 k+ u3 [* B# ^
* P6 w3 B# t! s5 I" k9 sRound 3
& E1 U( W% w, w9 vs 10 = 9 > 10
+ w0 o$ R2 s& X: t) G h- y" v% [" T* n4 v0 j& S- ^
The answer is 10.8 p. R! H& e8 E) B, S$ l4 A
( S' u8 F: _" X9 F
e.g. #2 假設7為較輕的一粒" n/ J$ L, e0 O% }# @2 v+ ?
Round 1
$ f5 R5 S7 a( Y9 u6 l) U1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8
3 E- h' i6 T# Y4 Q) m1 c& q
8 Y( b: R A5 N3 @5 aRound 2
' m+ O$ m d7 a5 C5,6 vs 7,8 = 5,6 > 7,8
& j1 V+ Y' r! B# X9 C3 q( U" c; S; _* Q8 s1 J) K- H- [9 w
Round 3
+ m- H$ a* L3 J. Z) j1 l7 vs 8 = 7 < 8
; J$ t) C* o2 k" p2 T# t+ T
3 ^0 y. t- e( y/ D, g- R3 KThe answer is 7.
5 @3 ?0 q/ `: H5 J3 _; B
# \( J, A B& |" We.g. #3 假設13為較輕的一粒
9 w2 j' w( P* x; ?; z4 ~, u! vRound 1: S! \$ P8 g5 `
1,2,3,4 vs 5,6,7,8 = equal
2 s0 Z" u1 k" s
" n; ~4 D8 o' S; Y: @, oRound 2
9 u9 v5 @7 @; H5 w6 i+ p2 o9,10 vs 11,12 = equal0 n9 ^% I3 [' H- _+ \
7 d. S9 o3 j# r' v9 y7 tNo Round 3
5 I( G! D" K0 J4 O
1 c1 }! f9 o8 m$ `, L5 @0 I- lThe answer is 13.( I1 j) M2 }: ]4 J M/ N
: K3 i6 X% b/ ]6 _" c0 y
唔知我答得正唔正確呢?! 
+ G* w! e- e( l$ B) p0 g- F% T% k; H! x( J( k$ }
[ Last edited by hello1997 on 2007-3-2 at 12:39 AM ] |
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