优课网
首页
数学
语文
英语
化学
物理
政治
历史
生物
首页
> 用换元法解方程:x+1x-xx+1=32-数学
用换元法解方程:x+1x-xx+1=32-数学
题目简介
用换元法解方程:x+1x-xx+1=32-数学
题目详情
用换元法解方程:
x+1
x
-
x
x+1
=
3
2
题型:解答题
难度:中档
来源:西城区模拟
答案
设
class="stub"x+1
x
=y
,那么
class="stub"x
x+1
=
class="stub"1
y
,
原方程变形为:
y-
class="stub"1
y
=
class="stub"3
2
,
整理,得:2y2-3y-2=0,
解得:
y
1
=2,
y
2
=-
class="stub"1
2
.
当y=2时,
class="stub"x+1
x
=2
,
解得:x=1.
当
y=-
class="stub"1
2
时,
class="stub"x+1
x
=-
class="stub"1
2
解得:
x=-
class="stub"2
3
.
经检验:x1=1,x2=-
class="stub"2
3
是原方程的解.
上一篇 :
Before my father moved off,
下一篇 :
解方程:1x+1+1x-1=0.-数学
搜索答案
更多内容推荐
— Would you like to go camping with me when the summer holiday comes?— I really dislike camping, but
Danny Way's jumping over the Great Wall and ______ his own dream should be an inspiration to th
The shower that we put in a few years back has broken and we cannot afford to________it.[ ]A. reduce
After _____from his illness, Mr.Smith was advised to take up gardening as a hobby.[ ]A. benefitingB.
A harmonious society is very important, so all the laws must be strictly _____. [ ]A. watched B. obs
若分式的值为0,则x的值为.-八年级数学
— What are we going to do after work? — I'm thinking that we could _____a movie. [ ]A. take dow
-What do you think we can do for our aged parents? -You_______ do anything except to be with them an
—Have you finished your book report?—Not yet. I couldn't________on it with so loud music next d
The agreement indicates that the two companies will _____ with each other again.[ ]A. team up B. tur
Rather than________to the park,I would prefer to spend the weekend at home.[ ]A.to goB.goC.wentD.to
解方程:1x-1+x2-3xx2-1=-2.-数学
There are many things that I can't_____ going abroad,of which is the ignorance of the locals.[
Some high officers were punished by law only because they were _______ what didn’t belong to them.A.
解方程:3x-2=2-xx-2-数学
计算:.-八年级数学
计算:.-八年级数学
Cynthia is not ashamed of what she does, even if she _____ doing something wrong. [ ] A. keeps up B.
(-xy3)2的计算结果是:()A.xy5B.x2y6C.-x2y6D.x2y5-八年级数学
短文改错。Dear Alice,I have just got some good news to tell to you. I win a national prize for painting l
Having noticed that she was followed by someone, she stopped and looked at the shop window, _____to
如果用换元法解方程x2-1x-3xx2-1+2=0,设y=x2-1x,那么原方程可化为()A.y2-3y+2=0B.y2+3y-2=0C.y2-2y+3=0D.y2+2y-3=0-数学
Attention, please! ________ for your luggage on the train or the bus![ ]A. Break outB. Turn outC. Wa
The stories of Guo Mingyi are really moving. __________ he is the most moving and respectable man I
用换元法解方程(xx+2)2-5(xx+2)+6=0-数学
Scientific researches show that to _________ a language one had better often get exposed to it.A.ack
I'd like to have these documents _______ in a minute. [ ]A. sorting outB. sorted out C. to be s
已知,则的值为()A.B.C.2D.-八年级数学
下列方程不是整式方程的是()A.22x2-12x=1B.0.2x2-0.4x3=0C.x2+15=3D.1x2+x=2-数学
We can_____skills from social practice activities.[ ]A. lost B. gained C. kept D. took-高一英语
It is surfing on the Internet late into the night that my getting up late.[ ]A. sticks to B. leads t
解方程:x2-2x-2=3x2-2x-数学
关于x的方程x2-(5k+1)x+k2-2=0,是否存在负数k,使方程的两个实数根的倒数和等于4?若存在,求出满足条件的k的值;若不存在,说明理由.-数学
解方程:x2=6x2-x+x-1-数学
I make no apologies for the way I have _____myself over the years and I have no regrets. [ ]A. behav
The volcano________in 1946 after one hundred and twenty years of silence.[ ]A. explodedB. burstC. er
若解分式方程2xx+1-x+1x=a-1x2+x产生增根,则a的值为()A.-1或2B.1或2C.0或3D.0或-3-数学
We should give students more chances to _______ the problems in their daily lives.A.deal withB.end u
— How about her songs?— Very well, and she can also dance. She is _______ a singer.A.more thanB.bett
The train had not come yet and the man ______ his watch anxiously.A.focused onB.glanced atC.watchedD
Practising Chinese kungfu (功夫)can not only ____ one’s strength, but also develop one’s character.A.b
Stay away from Lynch.He’s a liar.You’ll be cheated if you don’t __________. [ ]A. break outdenB. wat
It may not rain; but you’d better take an umbrella ______.A.in returnB.in needC.in caseD.in fact-高一英
The hotel ____ me $50 for a single room during one night.A.tookB.costC.chargedD.paid-高二英语
解方程:xx+1+1=2x+1x.-数学
若关于x的方程2x+mx-2=1的解为正数,求m的取值范围.-数学
用换元法解方程x2-3x+8x2-3x+1=5,如果设x2-3x+1=y,那么原方程可化为关于y的一元二次方程的一般式为______.-数学
如图,点A、B在数轴上,它们所对应的数分别是-4,,且点A、B到原点的距离相等,求x的值。-九年级数学
We are going to do some shopping. Willyou _ us? [ ]A. take part inB. join in C. joinD. take-高三英语
The Bull team _____ the football match and they _____ much experience in playing football. [ ]A. gai
返回顶部
题目简介
用换元法解方程:x+1x-xx+1=32-数学
题目详情
答案
原方程变形为:y-
整理,得:2y2-3y-2=0,
解得:y1=2,y2=-
当y=2时,
解得:x=1.
当y=-
解得:x=-
经检验:x1=1,x2=-