求方程2000:(X+3)+4800:(X-1)=6800:X的解,要有步骤
答案:6 悬赏:20 手机版
解决时间 2021-03-24 13:26
- 提问者网友:那叫心脏的地方装的都是你
- 2021-03-23 18:33
求方程2000:(X+3)+4800:(X-1)=6800:X的解,要有步骤
最佳答案
- 五星知识达人网友:污到你湿
- 2021-03-23 19:03
2000:(X+3)+4800:(X-1)=6800:X
解:2000/(X+3)+4800/(X-1)=6800/X
∵方程有意义的条件是分母不等于0
∴x+3≠0,x-1≠0,x≠0
∴x≠-3,0,1
方程两边同时乘以:[(x+3)(x-1)x]/400
5x(x-1)+12x(x+3)=17(x+3)(x-1)
5x²-5x+12x²+36x=17x²+34x-51
3x=51
∴x=17
解:2000/(X+3)+4800/(X-1)=6800/X
∵方程有意义的条件是分母不等于0
∴x+3≠0,x-1≠0,x≠0
∴x≠-3,0,1
方程两边同时乘以:[(x+3)(x-1)x]/400
5x(x-1)+12x(x+3)=17(x+3)(x-1)
5x²-5x+12x²+36x=17x²+34x-51
3x=51
∴x=17
全部回答
- 1楼网友:末日狂欢
- 2021-03-24 01:10
1.约分得
5(x+3)+12:(x-1)=17:x
2.两边同乘以x(x+3)(x-1)得
5x(x-1)+12x(x+3)=17(x+3)(x-1)
3.打开括号得 x=17
5(x+3)+12:(x-1)=17:x
2.两边同乘以x(x+3)(x-1)得
5x(x-1)+12x(x+3)=17(x+3)(x-1)
3.打开括号得 x=17
- 2楼网友:忘川信使
- 2021-03-23 23:37
2000:(X+3)+4800:(X-1)=6800:x
5:(X+3)+12:(X-1)=17:x
5x(X-1)+12x(x+3)=17(x+3)(x-1)
5x^2-5x+12x^2+36x=17x^2+34x-51
3x=51
x=17
望采纳 谢谢
5:(X+3)+12:(X-1)=17:x
5x(X-1)+12x(x+3)=17(x+3)(x-1)
5x^2-5x+12x^2+36x=17x^2+34x-51
3x=51
x=17
望采纳 谢谢
- 3楼网友:轮獄道
- 2021-03-23 22:08
2000:(X+3)+4800:(X-1)=6800:X
2000/(x+3)+4800/(x-1)=6800/x 两边同除以400
5/(x+3)+12/(x-1)=17/x 两边同乘x(x+3)(x-1)
5(x-1)x+12(x+3)x=17(x+3)(x-1)
5x^2-5x+12x^2+36x=17x^2+34x-51
31x=34x-51
3x=51
x=17
2000/(x+3)+4800/(x-1)=6800/x 两边同除以400
5/(x+3)+12/(x-1)=17/x 两边同乘x(x+3)(x-1)
5(x-1)x+12(x+3)x=17(x+3)(x-1)
5x^2-5x+12x^2+36x=17x^2+34x-51
31x=34x-51
3x=51
x=17
- 4楼网友:归鹤鸣
- 2021-03-23 21:04
2000/(X+3)+4800/(X-1)=6800/X
等式两边同时除以400
5/(X+3)+12/(X-1)=17/X
(5x-5+12x+36)/(x+3)(x-1)=17/x
(17x+31)x=17(x+3)(x-1)
17x²+31x=17x²+34x-51
51=3x
x=51/3
x=17
希望对你有所帮助
如有问题,可以追问。
谢谢采纳
等式两边同时除以400
5/(X+3)+12/(X-1)=17/X
(5x-5+12x+36)/(x+3)(x-1)=17/x
(17x+31)x=17(x+3)(x-1)
17x²+31x=17x²+34x-51
51=3x
x=51/3
x=17
希望对你有所帮助
如有问题,可以追问。
谢谢采纳
- 5楼网友:杯酒困英雄
- 2021-03-23 19:58
解:
2000:(x+3)+4800:(x-1)=6800:x
2000/(x+3)+4800/(x-1)=6800/x
5/(x+3)+12/(x-1)=17/x
5x(x-1)/[x(x+3)(x-1)]+12x(x+3)/[x(x+3)(x-1)]=17(x+3)(x-1)/[x(x+3)(x-1)]
[5x(x-1)+12x(x+3)-17(x+3)(x-1)]/[x(x+3)(x-1)]=0
5x(x-1)+12x(x+3)-17(x+3)(x-1)=0
5x^2-5x+12x^2+36x-17x^2-34x+51=0
3x-51=0
x=17
2000:(x+3)+4800:(x-1)=6800:x
2000/(x+3)+4800/(x-1)=6800/x
5/(x+3)+12/(x-1)=17/x
5x(x-1)/[x(x+3)(x-1)]+12x(x+3)/[x(x+3)(x-1)]=17(x+3)(x-1)/[x(x+3)(x-1)]
[5x(x-1)+12x(x+3)-17(x+3)(x-1)]/[x(x+3)(x-1)]=0
5x(x-1)+12x(x+3)-17(x+3)(x-1)=0
5x^2-5x+12x^2+36x-17x^2-34x+51=0
3x-51=0
x=17
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