一條中四數學

2007-10-03 5:08 am
solove the following quadratic equations by the method of factorization:
7x^2=4x

回答 (4)

2007-10-03 5:20 am
✔ 最佳答案
7x^2=4x
7x^2 - 4x=0 (減個4x去左邊)
x(7x-4)=0 (將個x抽出黎)
therefore x=0 or (7x-4)=0 (因為兩個數乘埋係0,所以其中一個會係0)
therefore x=0 or x=4/7 (將 7x-4 solve左佢)

搞掂!
希望可以幫到你
參考: 自己
2007-10-03 5:22 am
過程太麻煩
答案:x=0
2007-10-03 5:19 am
7x^2 - 4x = 0

拿x出來作common factor =

x(7x-4)=0

所以可以寫成

x=0 or 7x-4=0

x=0 or x= 4/7 (2 answers)
2007-10-03 5:16 am
7x^2=4x

7x^2-4x=0

x(7x-4)=0

So x=0 or 7x-4=0

x=0 or 4/7
參考: Myself


收錄日期: 2021-04-24 00:25:20
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20071002000051KK03833

檢視 Wayback Machine 備份