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)

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參考: 自己

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2007-10-03 5:22 am

過程太麻煩
答案:x=0

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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)

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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

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