(A+B)+(A-B)x=3x+5
回答 (8)
2006-11-08 2:59 am
✔ 最佳答案
(A+B)+(A-B)x=3x+5A+B+(A-B)x=3x+5
(A – B)x – 3x = 5 – A – B
(A – B – 3)x = 5 – A – B
x = (5 – A – B) / (A – B – 3)
2006-11-07 19:20:50 補充：
若這題不是方程式，而是恒等式則(A+B)+(A-B)x=3x+5A + B = 5 ___(1)A – B = 3 ___(2)(1)式加(2)式2A = 8A = 4(1)式減(2)式2B = 2B = 1
2006-11-08 3:08 am
唔知你想求邊個unknown
求x的話：
(A+B)+(A-B)x=3x+5
A+B=3x+5-(A-B)x
A+B=x(3-A+B)+5
A+B-5=x(3-A+B)
x=A+B-5
ˉ----------
ˉ3-A+B
求x的話：
(A+B)+(A-B)x=3x+5
A+B=3x+5-(A-B)x
A+B=x(3-A+B)+5
A+B-5=x(3-A+B)
x=A+B-5
ˉ----------
ˉ3-A+B
2006-11-08 3:04 am
(A+B)+(A-B)X+3X+5=A+B+A-B*X=3X+5
A*X=3X+5....................................
SOR真係唔識最多係咁多
A*X=3X+5....................................
SOR真係唔識最多係咁多
2006-11-08 3:02 am
(A+B)+(A-B)x=3x+5
A+B+(A-B)x=3x+5
(A – B)x – 3x = 5 – A – B
(A – B – 3)x = 5 – A – B
x = (5 – A – B) / (A – B – 3)
A+B+(A-B)x=3x+5
(A – B)x – 3x = 5 – A – B
(A – B – 3)x = 5 – A – B
x = (5 – A – B) / (A – B – 3)
2006-11-08 3:01 am
我不明白
sorry.........
sorry.........
2006-11-08 3:00 am
我不明白你想發問什麼 ?
sorry !
sorry !
2006-11-08 2:59 am
comparing the coefficient
A+B=3
A-B=5
2A=8
A=4
B=-1
2007-04-17 17:47:16 補充：
x = (5 – A – B) / (A – B – 3)
A+B=3
A-B=5
2A=8
A=4
B=-1
2007-04-17 17:47:16 補充：
x = (5 – A – B) / (A – B – 3)
收錄日期: 2021-04-12 21:49:37
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