F2 MATHS

2008-12-29 7:24 pm
(A+B)x-A=-2x-1
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更新1:

問A=? B=?

更新2:

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回答 (2)

2009-01-01 6:18 am
✔ 最佳答案
(A+B)x-A=-2x-1

Ax+Bx-A=-2x-1

By comparing like terms,

-A=-1, Ax+Bx=-2x
A= 1 A+B=-2
1+B=-2
B=-2-1
B=-3
2008-12-29 7:48 pm
A = 1
A+B = -2
1+B = -2
B = -3
參考: ME


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