4個自然數

2006-11-01 3:14 am
有4個自然數,它們的和是14。如果把它們填入下列四個括號內,其計算的結果相加仍然是14。你能把這4個自然數找出來嗎?
( ) – 1 = ?
( ) × 2 = ?
( ) × 3 = ?
+ ( ) – 4 = ?
_________________
14

回答 (4)

2007-01-03 2:54 am
You are smart!
2006-11-01 3:32 am
a -1 = ?
2b = ?
3c = ?
d - 4 = ?

(a-1) + 2b + 3c + (d-4) = 4?
a + b + c + d - 1 + b + 2c - 4 = 4?
14 - 5 + b + 2c = 14
b + 2c = 5

b = 1 when c = 2 or b = 3 when c = 1

case1:
a -1 = ?
2(1) = 2
3(2) = 6
d - 4 = ?
>>
a+1+2+d=14(d>4)
a+d=11
d=5 when a=6 d=6 when a=5......

所以a=6 b=1 c=2 d=5, a=5 b=1 c=2 d=6......
你做埋落去, 但仲有case2......

2006-11-09 22:37:46 補充:
雖然佢快d, 但係我覺得我個方法好 d 喎, 可以搵晒全部可能, 我估佢都係撞 d 數字出黎
2006-11-01 3:25 am
1-1=0
1x2=2
2x3=6
10-4=6

1+1+2+10=14
0+2+6+6=14
參考: 我
2006-11-01 3:21 am
(2 ) – 1 = ?
(5) × 2 = ?
(1) × 3 = ?
+ (4) – 4 = ?
_________________
14


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