有冇人可以講比我知點解呢條數點樣計(方程)︰
a - 0.3a = 500
a = ?
答下我啦，please！
(同埋可唔可以講比我聴點解係咁計)
有關數學一問~~~
2006-12-09 4:37 am
回答 (7)
2006-12-09 5:42 am
✔ 最佳答案
你有唔同既方法去做:1)
a - 0.3a = 500
0.7a = 500
a = 500/0.7
a = 5000/7
2)
10(a - 0.3a) = 10(500)
10a - 3a = 5000
7a = 5000
a = 5000/7
2006-12-09 6:35 am
a-0.3a=500
(1-0.3)a=500
0.7a=500
a=500/0.7
a=714.28.......
a=714(corr. to 3 sig. fig.)
(1-0.3)a=500
0.7a=500
a=500/0.7
a=714.28.......
a=714(corr. to 3 sig. fig.)
2006-12-09 5:15 am
a - 0.3a = 500
a-0.3a=0.7a
500=0.7a
71.42855....=0.1a
a=71.42855x10=714.2855
a-0.3a=0.7a
500=0.7a
71.42855....=0.1a
a=71.42855x10=714.2855
2006-12-09 4:46 am
a - 0.3a = 500
1a - 0.3a = 500 ----a=1a
(1 - 0.3)a= 500 ----抽出
0.7a = 500
a = 500/0.7 ----調過去除
a = 714.28571....
1a - 0.3a = 500 ----a=1a
(1 - 0.3)a= 500 ----抽出
0.7a = 500
a = 500/0.7 ----調過去除
a = 714.28571....
2006-12-09 4:45 am
a - 0.3a = 500
0.7a=500
a=500/0.7
a=7142 6
---
7
0.7a=500
a=500/0.7
a=7142 6
---
7
2006-12-09 4:44 am
a-0.3a=500
0.7a=500(等於1-0.3)
a=500/0.7
a=七又四分之一(唔識打出黎)
2006-12-08 20:44:58 補充：
*七又七分之一
0.7a=500(等於1-0.3)
a=500/0.7
a=七又四分之一(唔識打出黎)
2006-12-08 20:44:58 補充：
*七又七分之一
參考: 自己計
2006-12-09 4:43 am
a-0.3a = 500
0.7a =500
a =500/0.7
0.7a =500
a =500/0.7
收錄日期: 2021-04-12 18:16:45
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20061208000051KK03925