(X - 4) (X) + (2X - 1)=X2 - (4 -X)
X2 IS X的2次方
MATHS......
2007-02-01 3:50 am
回答 (2)
2007-02-01 3:56 am
✔ 最佳答案
(X - 4) (X) + (2X - 1)=X2 - (4 -X)(x^2-4x)+(2x-1)=x^2-4+x
x^2+2x-1=x^2-4+x
2x-1=x-4
2x-x=-4+1
x=-3
2007-02-01 4:05 am
(x-4)(x)+(2x-1)=x^2-(4-x)
x^2-4x+2x-1=x^2-4+x
x^2-x^2-4x-x+2x=1
-3x=1
x= -3
x^2-4x+2x-1=x^2-4+x
x^2-x^2-4x-x+2x=1
-3x=1
x= -3
收錄日期: 2021-04-23 16:41:22
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070131000051KK03184