math f.2

2009-07-28 12:08 am
if (a+b)x+(b-a)y≡8x-2y,find the values of A and B.

吾識計e啲晨目..help me..

回答 (2)

2009-07-28 12:45 am
✔ 最佳答案
由於這是恆等式,所以左方 = 右方

因此,

A + B = 8 ... (1)

B - A = -2 ... (2)

式(1) + 式(2):

2B = 8 - 2 = 6

B = 3

代B = 3入式(1)

A + 3 = 8

A = 8 - 3 = 5

所以,A = 5,B = 3

參考: Physics king
2009-07-28 1:25 am
我明左你既方法啦..thx你..


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