A 2-digit number is divisible by both 2 and 5. Half this number is less than 6 times the tens digit of the numer by 4. Find this 2-digit number.
請解釋上列問題講緊什麼同列式計算
P.S. 用中文
英文數學問題
2006-12-22 4:25 am
回答 (2)
2006-12-23 12:23 am
✔ 最佳答案
A 2-digit number is divisible by both 2 and 5. Half this number is less than 6 times the tens digit of the numer by 4. Find this 2-digit number.一個2位數可以被2和5整除. 這數字的一半減这數字的十位數6倍少4. 找这2位數字。
因為这2位數同時可以被2同5整除,因此個位數係0
設十位數係x
这2位數字係(10x+0)
10x/2=6x-4
10x/2 -6x=-4
10x-12x=-8
-2x=-8
x=4
2位數字係10(4)+0=40
2006-12-22 4:31 am
係2同5嘅倍數就即係10嘅倍數所以會係0字尾
設十位為x
(10x/2 )+4 = 6x
(10x + 8)/2 = 6x
5x+4 = 6x
x = 4
所以該數係40
設十位為x
(10x/2 )+4 = 6x
(10x + 8)/2 = 6x
5x+4 = 6x
x = 4
所以該數係40
收錄日期: 2021-04-23 16:30:46
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20061221000051KK03615