Tim x biet x^2014 + x^2012 + x^2010 + ... + x^2 + 1=
Tim x biet: 1/10+1/15+1/21+.........+2/x.(x+1) = 2010/2012
Tim x biet x-1/2015 + x-2/2014= x-3/2013 + x-4/2012
=>(x-1)/2015 - 1 + (x-2(/2014 -1 = (x-3)/2013 -1 + (x-4)/2012 -1
=>(x-2016)*(1/2015+1/2014-1/2013-1/2012)=0
=>x=2016
Trừ 1 ở mỗi p/s,ta có:
\(\left(\frac{x-1}{2015}-1\right)+\left(\frac{x-2}{2014}-1\right)=\left(\frac{x-3}{2013}-1\right)+\left(\frac{x-4}{2012}-1\right)\)
\(\Leftrightarrow\left(\frac{x-2016}{2015}\right)+\left(\frac{x-2016}{2014}\right)=\left(\frac{x-2016}{2013}\right)+\left(\frac{x-2016}{2012}\right)\)
\(\Leftrightarrow\frac{x-2016}{2015}+\frac{x-2016}{2014}-\frac{x-2016}{2013}-\frac{x-2016}{2012}=0\)
\(\Leftrightarrow\left(x-2016\right)\left(\frac{1}{2015}+\frac{1}{2014}-\frac{1}{2013}-\frac{1}{2012}\right)=0\)
Vì \(\frac{1}{2015}+\frac{1}{2014}-\frac{1}{2013}-\frac{1}{2012}\ne0\)
=>x-2016=0
=>x=2016
Vậy..................
mình hỏi bài này :tìm số tự nhiên x biết :(x-2)^2014=(x-2)^2016
tim x biet
x + 4/2009 + x + 3 / 2010 = x + 2/2011 + x + 1/2012
tim x biet (1/2+1/3+...+1/2014).x=2013/1+2012/2+...+1/2013
Tim x biet [x - 2]x + 2012 - [ x - 2]x + 2010 = 0
ai giai xong ket ban voi mik nha
\(x^{x+2012}\)-\(2^{x+2012}\)-\(x^{x+2010}\)-\(2^{x+2010}\)=0
x2-22=0
\(x^2\)-4 =0
x2 =0+4=4
=> x=2 hoặc là -2
\(\Leftrightarrow\left(x-2\right)^{x+2010}\left(\left(x-2\right)^2-1\right)=0\)
ĐK :\(x-2\ge1\Leftrightarrow x\ge1\)phuương trình trở thành
Hoặc : \(\left(x-2\right)^2-1=0\Leftrightarrow\left(x-2-1\right)\left(x-2+1\right)=0\Leftrightarrow\left(x-3\right)\left(x-1\right)=0\)\(\Leftrightarrow\orbr{\begin{cases}x=3\\x=1\end{cases}TMDK}\)Hoặc : vì theo tính chất lũy thừa nên \(\left(x-2\right)^{x+2010}\ne0\)KL nghiệm
\(\left(x-2\right)^{x+2012}-\left(x-2\right)^{x+2010}=0\)
\(\Leftrightarrow\left(x-2\right)^{x+2010}\times\left[\left(x-2\right)^2-1\right]=0\)
\(\Rightarrow\orbr{\begin{cases}\left(x-2\right)^{x+2010}=0\\\left(x-2\right)^2-1=0\end{cases}}\)\(\Leftrightarrow\orbr{\begin{cases}x-2=0\\\left(x-2\right)^2=1\end{cases}}\)\(\Leftrightarrow\orbr{\begin{cases}x-2=0\\x-2=1\end{cases}}\)\(\Rightarrow\orbr{\begin{cases}x=0+2=2\\x=1+2=3\end{cases}}\)
Vậy \(\orbr{\begin{cases}x=2\\x=3\end{cases}}\)
tim x biet (1/2+1/3+...+1/2014).x=2013/1+2012/2+...+1/2013
Toán lớp 7
cách làm 8 li-ke
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a, Tim x, y biet: x + y/2012 = xy/2013 = x - y/2014
Theo bài ra có:
(X+y+x-y):(2012+2014)=xy/2013
<=> 2x/4026 = xy/2013
=> y=1
(X+1):2012=x/2013
<=> 2013x+2013=2012x
X=-2013
tìm x biết x^2014+x^2012+x^2010+...+x^2+1=2
Ta có: \(x^{2014}+x^{2012}+x^{2010}+...+x^2+1=0\)
=>\(x^{2014}+x^{2012}+x^{2010}+...+x^2=0-1=\left(-1\right)\)
Vô lí => X không có giá trị .
\frac{x-10}{2010}+\frac{x-8}{2012}+\frac{x-6}{2014}+\frac{x-4}{2016}+\frac{x-2}{2018}=\frac{x-2018}{2}+\frac{x-2016}{4}+\frac{x-2014}{6}+\frac{x-2012}{8}+\frac{x-2010}{10}