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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 A9 }; b$ Z1 N9 W' s
. o8 [- G" u0 s" n- PGroup A: 1,2,3,4
# s, P% d: `; B8 r7 Q' A6 N% QGroup B: 5,6,7,8
& [( f" T) G; i: j% SGroup C: 9,10,11,12
$ ]6 o$ }( h1 ?- y# v9 b) hGroup D: 13( z/ m" k( M+ L' C; a' A/ N
+ B9 Q- q% X! ERound 1, ~) X( o, N( |
Group A vs Group B
4 V A# _* Y1 i; M& @如A and B一樣, 即較輕一粒在Group C or D
p4 E+ K }! [
& G. Y$ d3 m7 a* v+ n* @/ r, gRound 2
( q/ q, N- q1 C% _* ?( @! P再在Group C拆成:
! i! _% o0 d4 l3 x! r" S+ x$ TGroup Ca: 9,10
7 r2 |( d( @" P# G! JGroup Cb: 11,12
: Z" |* j; `0 t' K6 K然後再秤, 如一樣, 即13為較輕一粒.
: |& ~: ]+ b% F! |, G/ W; z8 f# Y) P9 ]
如不同, 即較輕一組有一粒較輕波子在其中,
9 D1 v9 O9 D% V Z3 E0 H' |要再秤, Round 3, 之後便知答案.$ _6 q$ |9 r% h1 O; W5 _ X/ K3 q; E
6 W, L$ ^, q9 xe.g. #1 假設10為較輕的一粒* O9 k& r- S) _
Round 1
8 D3 L! g2 ]4 H }$ L4 ]+ P5 G1,2,3,4 vs 5,6,7,8 = equal
+ }7 x4 ~/ v( K" k# L
0 l0 P, l7 Q3 u+ W% b$ D7 qRound 23 X+ T/ w7 W) Z
9,10 vs 11,12 = 9,10 < 11,12! `" P; ~! a! U" B
' o/ O+ _" ~, T+ z$ URound 3
S" O5 [+ O; O% x0 X9 vs 10 = 9 > 10
+ _' w. z, d& ?" \4 ~& p5 Q1 f& N1 g7 O. [3 y3 ^
The answer is 10.
6 ?, \4 o) {. V1 y. K, ~; O$ O. v7 Z4 J4 ?
e.g. #2 假設7為較輕的一粒
7 D' w( O' G+ f( H" U% a8 e( ^Round 1
# U L7 d& E( i1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,83 n9 H6 J1 I0 @. Y; \4 l& ?
8 |; P* K% {% n
Round 2- o# w* u; Z9 Q. _
5,6 vs 7,8 = 5,6 > 7,82 k$ h/ Q* z( B* E
2 O# a& e+ B H4 h( i- a
Round 3
- c9 j3 o# }7 J: \3 N$ h, ?7 vs 8 = 7 < 8& {, a+ o( P8 E9 q
5 I8 R4 z" L, h: c8 T7 NThe answer is 7./ s- { y$ Q* G: U. F
$ j2 A: [4 E. h! ]* o. Ye.g. #3 假設13為較輕的一粒
! C4 ~: _# K7 z7 s5 G9 dRound 1( ?9 X6 X* x, H l
1,2,3,4 vs 5,6,7,8 = equal
: \2 }8 X8 k0 W& X) I
- u" O X: r. U( k" oRound 2: x% v' W; b5 S: S& Y
9,10 vs 11,12 = equal
* V5 h7 G" [2 |* h
; [8 e) E2 s3 w- M, T2 E* n! l# X# sNo Round 3
& S) c8 E* ~* V+ r5 _# r( c+ ]+ t i/ ^( K
The answer is 13., ~/ | Y* z- z( _9 n- ^
3 l: I( x7 f# V- H6 [( p5 E" u唔知我答得正唔正確呢?! ' J6 C; ~2 q. ^( h+ F2 G* h; @
4 ~9 ^2 k0 C6 d; j. ~! f. _: i
[ Last edited by hello1997 on 2007-3-2 at 12:39 AM ] |
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