Solve the following equations:
(1) 1/2x-7=5+x
(2) Solve the equation 5/3x-1/6x = 3
A. -2 B. 18/11 C. 19/10 D. 2
(3) Solve the equation 5x+7/6 - 4x+2/3 = 5/7(x-3) + 3/14
A. 11 B.2 C. -2 D. -11
mathematics F.1-F.2
2007-08-05 7:23 am
回答 (2)
2007-08-05 7:34 am
✔ 最佳答案
(1)1/2x-7=5+x
1/2x=12
x=24
(2)
5/3x-1/6x = 3
3/2x=3
x=2
Answer:D
(3)
5x+7/6 - 4x+2/3 = 5/7(x-3) + 3/14
x+11/6=5/7x-15/7+3/14
2/7x=-79/21
x=-79/6
[呢題可能係題目寫錯!!!]
2007-08-05 8:00 am
是求x吧?
1. 1/2x-7=5+x
題1
解;1/2x-12-x=0
-2x^2-24x-1=0﹝全式乘以2x﹞
2x^2+24x+1=0﹝抽負號﹞
x1=-b+ 【√(b^2-4ac)】/2<----這是公式黎的
x2=-b-【 √(b^2-4ac)】/2
因為a=2,b=24,c=1,代入公式:x1=-12+2 √33,2=-12-2 √33
題2
5/3x-1/6x = 3
解:10/6x-1/6x=3
(10-1)/6x=3
3/2x=3
x=2(案答選d)
題3
x+7/6 - 4x+2/3 = 5/7(x-3) + 3/14<---你是否想寫
(x+7)/6 -( 4x+2)/3 = 5/7(x-3) + 3/14
你決定了再答你這題吧
2007-08-05 00:04:23 補充：
第二題錯了吧!應該是:-x/2-2x/2=12 -3x/2=12-3x=24x=-8
1. 1/2x-7=5+x
題1
解;1/2x-12-x=0
-2x^2-24x-1=0﹝全式乘以2x﹞
2x^2+24x+1=0﹝抽負號﹞
x1=-b+ 【√(b^2-4ac)】/2<----這是公式黎的
x2=-b-【 √(b^2-4ac)】/2
因為a=2,b=24,c=1,代入公式:x1=-12+2 √33,2=-12-2 √33
題2
5/3x-1/6x = 3
解:10/6x-1/6x=3
(10-1)/6x=3
3/2x=3
x=2(案答選d)
題3
x+7/6 - 4x+2/3 = 5/7(x-3) + 3/14<---你是否想寫
(x+7)/6 -( 4x+2)/3 = 5/7(x-3) + 3/14
你決定了再答你這題吧
2007-08-05 00:04:23 補充：
第二題錯了吧!應該是:-x/2-2x/2=12 -3x/2=12-3x=24x=-8
收錄日期: 2021-04-25 17:17:29
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