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( x - 2 )2012 + | y2 - 9 |2014 = 0 ( 1 )
vì ( x - 2 )2012 \(\ge\)0 ; | y2 - 9 |2014 \(\ge\)0 ( 2 )
Từ ( 1 ) và ( 2 ) \(\Rightarrow\hept{\begin{cases}\left(x-2\right)^{2012}=0\\\left|y^2-9\right|^{2014}=0\end{cases}}\)
\(\Rightarrow\hept{\begin{cases}x-2=0\\y^2-9=0\end{cases}}\)
\(\Rightarrow\hept{\begin{cases}x=2\\y=3\end{cases}}\)
Vậy x = 2 ; y = 3
còn lại tương tự
Vì (x -2 )2012> hoặc =0 mà |y2 -9 |2014 > hoặc =0 nên để (x -2 )2012 + | y2 -9 |2014 =0 thì (x-2)2012 =0 và |y2 -9| =0
=>( x-2)=0 và y2-9=0
=>x=0 và y2=9
=>x=o và y=3 hoặc x= -3
C1:
b)=>y-1,5=0
=>y=1,5
(x-1)2=0
=>1
Vậy x=1;y=1,5
Ai thấy đúng thì
Ta có :
\(\frac{x+4}{2014}+\frac{x+3}{2015}=\frac{x+8}{2010}+\frac{x+7}{2011}\)
\(\Leftrightarrow\)\(\left(\frac{x+4}{2014}+1\right)+\left(\frac{x+3}{2015}+1\right)=\left(\frac{x+8}{2010}+1\right)+\left(\frac{x+7}{2011}+1\right)\)
\(\Leftrightarrow\)\(\frac{x+4+2014}{2014}+\frac{x+3+2015}{2015}=\frac{x+8+2010}{2010}+\frac{x+7+2011}{2011}\)
\(\Leftrightarrow\)\(\frac{x+2018}{2014}+\frac{x+2018}{2015}=\frac{x+2018}{2010}+\frac{x+2018}{2011}\)
\(\Leftrightarrow\)\(\frac{x+2018}{2014}+\frac{x+2018}{2015}-\frac{x+2018}{2010}-\frac{x+2018}{2011}=0\)
\(\Leftrightarrow\)\(\left(x-2018\right)\left(\frac{1}{2014}+\frac{1}{2015}-\frac{1}{2010}-\frac{1}{2011}\right)=0\)
Vì \(\frac{1}{2014}+\frac{1}{2015}-\frac{1}{2010}-\frac{1}{2011}\ne0\)
Nên \(x-2018=0\)
\(\Leftrightarrow\)\(x=2018\)
Vậy \(x=2018\)
Chúc bạn học tốt ~
Ta có: \(\frac{x+4}{2014}+\frac{x+3}{2015}=\frac{x+7}{2011}+\frac{x+8}{2010}\)
\(\Rightarrow\left(\frac{x+4}{2014}+1\right)+\left(\frac{x+3}{2015}+1\right)=\left(\frac{x+7}{2011}+1\right)+\left(\frac{x+8}{2010}+1\right)\)
\(\Rightarrow\frac{x+2018}{2014}+\frac{x+2018}{2013}=\frac{x+2018}{2011}+\frac{x+2018}{2010}\)
\(\Rightarrow\frac{x+2018}{2014}+\frac{x+2018}{2013}-\frac{x+2018}{2011}-\frac{x+2018}{2010}=0\)
\(\Rightarrow\left(x+2018\right)\left(\frac{1}{2014}+\frac{1}{2015}-\frac{1}{2011}-\frac{1}{2010}\right)=0\)
\(\Rightarrow x+2018=0\Rightarrow x=-2018\)
Chúc bn hc tốt! ^_^
\(\frac{x+2015}{x-2015}=\frac{y+2017}{y-2017}\)
\(\frac{x+2015}{y+2017}=\frac{x-2015}{y-2017}\)
Áp dụng tính chất của dãy tỉ số bằng nhau,ta có :
\(\frac{x+2015}{y+2017}=\frac{x-2015}{y-2017}=\frac{\left(x+2015\right)-\left(x-2015\right)}{\left(y+2017\right)-\left(y-2017\right)}=\frac{2015}{2017}\)( 1 )
\(\frac{x+2015}{y+2017}=\frac{x-2015}{y-2017}=\frac{\left(x+2015\right)+\left(x-2015\right)}{\left(y+2017\right)+\left(y-2017\right)}=\frac{x}{y}\)( 2 )
Từ ( 1 ) và ( 2 ) \(\Rightarrow\frac{x}{y}=\frac{2015}{2017}\)
a) \(\frac{x+2015}{5}+\frac{x+2016}{4}=\frac{x+2017}{3}+\frac{x+2018}{2}\)
\(\Leftrightarrow\frac{x+2015}{5}+\frac{5}{5}+\frac{x+2016}{4}+\frac{4}{4}=\frac{x+2017}{3}+\frac{3}{3}+\frac{x+2018}{2}+\frac{2}{2}\)
\(\Leftrightarrow\frac{x+2020}{5}+\frac{x+2020}{4}=\frac{x+2020}{3}+\frac{x+2002}{2}\)
\(\frac{x+2020}{5}+\frac{x+2020}{4}-\frac{x+2020}{3}-\frac{x+2020}{2}=0\)
\(\Leftrightarrow\left(x+2020\right).\left(\frac{1}{5}+\frac{1}{4}-\frac{1}{3}-\frac{1}{2}\right)=0\)
\(\Leftrightarrow x+2020=0\)
\(\Leftrightarrow x=-2020\)
Vậy : \(x=-2020\)
Chúc bạn học tốt !!
a) \(\frac{x+2015}{5}+\frac{x+2016}{4}=\frac{x+2017}{3}+\frac{x+2018}{2}\\ \left(\frac{x+2015}{5}+1\right)+\left(\frac{x+2016}{4}+1\right)=\left(\frac{x+2017}{3}+1\right)+\left(\frac{x+2018}{2}+1\right)\\ \frac{x+2020}{5}+\frac{x+2020}{4}=\frac{x+2020}{3}+\frac{x+2020}{2}\\ \frac{x+2020}{5}+\frac{x+2020}{4}-\frac{x+2020}{3}-\frac{x+2020}{2}=0\\ \left(x+2020\right)\left(\frac{1}{5}+\frac{1}{4}-\frac{1}{3}-\frac{1}{2}\right)=0\\ \Rightarrow x+2020=0\\ \Rightarrow x=-2020\)
Vậy x = -2020
b) \(\frac{x+2015}{5}+\frac{x+2016}{6}=\frac{x+2017}{7}+\frac{x+2018}{8}\\ \left(\frac{x+2015}{5}-1\right)+\left(\frac{x+2016}{6}-1\right)=\left(\frac{x+2017}{7}-1\right)+\left(\frac{x+2018}{8}-1\right)\\ \frac{x+2010}{5}+\frac{x+2010}{6}=\frac{x+2010}{7}+\frac{x+2010}{8}\\ \frac{x+2010}{5}+\frac{x+2010}{6}-\frac{x+2010}{7}-\frac{x+2010}{8}=0\\ \left(x+2010\right)\left(\frac{1}{5}+\frac{1}{6}-\frac{1}{7}-\frac{1}{8}\right)=0\\ \Rightarrow x+2010=0\\ \Rightarrow x=-2010\)
Vậy x = -2010
a/ => | x - 7 | = 5 + x
TH1: x - 7 = 5 + x => 0x = 12 (VN)
TH2: x - 7 = - 5 - x => 2x = 2 => x = 1
Vậy x = 1
b/ \(\Rightarrow\int^{x-2015\ge0}_{x+2015<0}\) \(\Rightarrow\int^{x\ge2015}_{x<-2015}\) (vô lí)
hoặc \(\int^{x-2015<0}_{x+2015\ge0}\) \(\Rightarrow\int^{x<2015}_{x\ge-2015}\) \(\Rightarrow-2015\le x<2015\)