3k+5分之k = 4 ，k=
a.0.25%
b.2.5%
c.25%
d.250%
我睇過答案，係c
但係唔知點解我ask d中學生
全部都計到k=20/16(即1.25=125%)
但係俾你揀既答案又冇喎
我d同學計到係c
但係我問佢解出黎
佢又話唔記得
我懷疑佢抄ans
咁答案係咩?
解出黎
20分架
一條勁難既數學題，20分
2007-08-30 7:38 pm
回答 (3)
2007-08-31 12:15 am
✔ 最佳答案
我知道佢地點樣計到呢兩個答案：中學生3k+5分之k = 4
3k+ｋ／５ = 4 （成條式乘以５）
１５ｋ＋ｋ＝２０
１６ｋ＝２０
ｋ＝２０／１６
(即1.25=125%)
而你既同學
3k+ｋ／５ = 4 （只把左邊式乘以５）
１５ｋ＋ｋ＝４
１６ｋ＝４
ｋ＝４／１６
（即０．２５＝２５％）
兩個答案只有第一個係岩既～而你同學可能唔小心用左第二個方法所以計錯～佢都唔一定係抄答案既～況且如果將數字代入去驗算都只有１２５％係正確的～
參考: 中六生
2007-08-30 7:50 pm
答案係 1.25 (125%)
有時d 書會印錯答案, 信自己如過
加上 如果用 25% 計, 都唔啱啦!
有時d 書會印錯答案, 信自己如過
加上 如果用 25% 計, 都唔啱啦!
2007-08-30 7:48 pm
3k+k/5=4
k(3+1/5)=4
k(15+1)/5=4
16k=4 x 5
k=20/16=1.25
Then the answer from your book maybe wrong, there maybe a typo mistake.
You should tell your teacher. There are many mistakes in books, you need to filter it yourself.
k(3+1/5)=4
k(15+1)/5=4
16k=4 x 5
k=20/16=1.25
Then the answer from your book maybe wrong, there maybe a typo mistake.
You should tell your teacher. There are many mistakes in books, you need to filter it yourself.
收錄日期: 2021-04-13 13:11:55
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070830000051KK01579