數學唔識做?please help

2007-07-24 1:41 am

Solve the following simultaneous equation with three unknows
a+b+c=4................(1)
2a-b+c=0...............(2)
2a+b-3c.................(3)

WB 有hint 話eliminate one of the three unknows and reduce the simultaneous equation into equation in two unknows.

但我5明

Please help!!!

更新1:

sorry 應該是 a+b+c=4................(1) 2a-b+c=0...............(2) 2a+b-3c=10...........(3)

回答 (2)

小草

2007-07-24 2:01 am

✔ 最佳答案

Pls note that your question formula 3 has something missing. Pls check.

After checking the questions, you may use the following procedures:

from Formula 1
c=4-b-a ............(4)

Sub (4) into (2)
2a-b+4-b-a=0
a-2b+4=0
b=(a+4)/2 .........(5)

Sub (4) and (5) into (3) and work out yourself.

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用戶135776

2007-07-24 2:05 am

你是否抄錯題目?

2a+b-3c=??.................(3)

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