F.4 附加數學絕對值

2009-08-15 3:46 am
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解方程|x+1|=2x+1
更新1:

點解x=-2/3要捨去?

回答 (3)

2009-08-15 4:58 am
✔ 最佳答案
As follows:

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2009-08-14 21:48:57 補充:
x=0 不用捨去,打錯了

2009-08-15 10:46:51 補充:
x=-2/3才 要捨去。
2009-08-15 6:33 am
-2/3不合因第一個條件是x<-1
答案只有 x = 0
2009-08-15 3:55 am
|x+1|=2x+1

x+1 = 2x+1 or x+1 = -(2x+1)
1-1 = 2x-x or x+1= -2x-1
0=x or x+2x= -1-1
x=0 or 3x=-2
x=-2/3


:)


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