maths f1

2007-10-09 3:29 am
The sum of three consecutive odd number is 81.Find the three numbers.詳細解釋點計!
點解條式會係
y+(y+2)+(y+4)=81
而唔係
y+(y+1)+(y+3=81)
解俾我聽,please!

回答 (4)

2007-10-09 3:46 am
✔ 最佳答案
因為 consecutive odd number 即係連續單數

用1,3,5做例子,1 同 3 ge 差係 2,1 同 5 ge 差係 4
再用11,13,15做例子,11 同 13 ge 差係 2,11 同 15 ge 差係 4

而呢條式 ge y 應該係指嗰 3 個連續單數中最小 ge 數
so y = 最小 ge 數
y+2 = 第二個數,因為第一個數同第二個數 ge 差係 2
y+4 = 第三個數,因為第一個數同第三個數 ge 差係 4

y+(y+2)+(y+4) = 81
3y+6 = 81
3y = 75
y = 25
∴The three consecutive odd number are 25,27,29.
參考: All by me
2007-10-09 3:40 am
如果係y+(y+1)+(y+3..

y 係odd number....y+1 就會become even number...y+3 also

so應該係y...y+2..y+4
參考: 自己
2007-10-09 3:39 am
如果淨係
three consecutive number =3個連續ge數字
你問題係three consecutive odd number =3個連續ge單數
例如1,3,5,7,9等

The sum of three consecutive odd number
當y=1
1+2=3, 1+4=5(都係單數)
但係1+3=4, 1+5=6(雙數), 所以唔岩

2007-10-08 19:41:32 補充:
f4有好多用到呢類型ge數~你要操熟d呀~d方程式都係, 或者你未教到, 不過都要注意!!

2007-10-08 19:41:37 補充:
f4有好多用到呢類型ge數~你要操熟d呀~d方程式都係, 或者你未教到, 不過都要注意!!
2007-10-09 3:36 am
咁你可以試唸下如果個3個數係1,3,5
而Y係1咁Y+2先會等於3而你加1只會等於2,所以條式係y+(y+2)+(y+4)=81


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