我想問關於數學代數的問題(急!!!最佳有30points)

2007-03-18 6:51 pm
1) (X -4)(X)+(2X-1) =X2次方-(4-X)

2) 2(2X+1)(X)=3x二次方+(X)(X-1)


以上的X 全不是代表乘號

回答 (2)

2007-03-18 7:19 pm
✔ 最佳答案
(1)
(X - 4)(X) + (2X - 1) = X^2 - (4 - X)
X^2 - 4X + 2X - 1 = X^2 - 4 + X
-2X - 1 = -4 + X
3 = 3X
X = 1

(2)
2(2X + 1)(X) = 3X^2 + (X)(X - 1)
4X^2 + 2X = 3X^2 + X^2 - X
3X = 0
X = 0
2007-03-19 7:25 pm
1.解:依題意得:

(x^2-4x)+2x-1=x^2-4+x

-4x+2x-x=-4+1

-3x=-3

x=1

2.解:依題意得:

4x^2+2x=3x^2+x^2-x

3x=0

x=0


收錄日期: 2021-04-12 18:47:27
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070318000051KK01164

檢視 Wayback Machine 備份