(A+B)+(A-B)x=3x+5
回答 (5)
2006-11-08 3:19 am
✔ 最佳答案
(A+B)+(A-B)x=3x+5 A + B = 5 ___(1)
A – B = 3 ___(2)
(1)式加(2)式
2A = 8
A = 4
(1)式減(2)式
2B = 2
B = 1
2006-11-09 1:08 am
(A + B) = 5 and (A - B) = 3
i.e. A - B = 3
A = 3 + B
substitute into A + B = 5
3 + B + B = 5
2B = 2
B = 1
then substitute B = 1 into A = 3 + B
= 3 + 1
= 4
thus, A = 4 and B =1
i.e. A - B = 3
A = 3 + B
substitute into A + B = 5
3 + B + B = 5
2B = 2
B = 1
then substitute B = 1 into A = 3 + B
= 3 + 1
= 4
thus, A = 4 and B =1
2006-11-08 3:22 am
A-B=3 A+B=5
A=4 B=1
A=4 B=1
2006-11-08 3:21 am
let a + b = 5 ( 1 )
let a - b = 3 ( 2 )
( 1 ) + ( 2 )
2a = 8
a = 4#
Sub a = 4 to ( 2 )
4 - b = 3
b = 1#
let a - b = 3 ( 2 )
( 1 ) + ( 2 )
2a = 8
a = 4#
Sub a = 4 to ( 2 )
4 - b = 3
b = 1#
2006-11-08 3:20 am
(A+B)+(A-B)x=3x+5
Therefore,
A+B=5 and A-B=3
Therefore, A =4, B =1
Therefore,
A+B=5 and A-B=3
Therefore, A =4, B =1
收錄日期: 2021-04-12 20:14:32
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20061107000051KK03217