tìm x
|x+2016|+|x+2017|+2018=3x
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Với x>0
\(\Rightarrow x+2016+x+2017+2018=3x\)
\(\Rightarrow x=2016+2017+2018\)
\(\Rightarrow x=6051\)(t/m)
Với x<0
\(\Rightarrow2016-x+2017-x+2018=3x\)
\(\Rightarrow6051-2x=3x\)
\(\Rightarrow x=\frac{6051}{5}\)(loại)
Ta có: \(\frac{x-2019}{2018}+\frac{x-2018}{2017}=\frac{x-2017}{2016}+\frac{x-2016}{2015}\)
\(\Leftrightarrow\left(\frac{x-2019}{2018}+1\right)+\left(\frac{x-2018}{2017}+1\right)=\left(\frac{x-2017}{2016}+1\right)+\left(\frac{x-2016}{2015}+1\right)\)
\(\Leftrightarrow\frac{x-1}{2018}+\frac{x-1}{2017}=\frac{x-1}{2016}+\frac{x-1}{2015}\)
\(\Leftrightarrow\frac{x-1}{2018}+\frac{x-1}{2017}-\frac{x-1}{2016}-\frac{x-1}{2015}=0\)
\(\Leftrightarrow\left(x-1\right)\left(\frac{1}{2018}+\frac{1}{2017}-\frac{1}{2016}-\frac{1}{2015}\right)=0\)
\(\Leftrightarrow x-1=0\)( vì \(\frac{1}{2018}+\frac{1}{2017}-\frac{1}{2016}-\frac{1}{2015}\ne0\))
\(\Leftrightarrow x=1\)
Vạy x=1
vế trái dương =>x>0
<=>x+2016+x+2017+2018=3x
x=2016+2017+2018=3.2017
\(|x+2016|+|x+2017|+2018=3x\)
\(x=2016+2017+2018\)\(\Rightarrow x=6051\)
|x+2016|+|x+2017|+2018=3x
<=> x + 2016 + x + 2017 + 2018 = 3x
<=> x + x - 3x = -2018 -2017-2016
<=> (1 + 1 - 3) x = - 6051
<=> -1x = -6051
<=> x =\(\frac{-6051}{-1}\)
<=> x = 6051
Vì I x + 2016 I > 0
I x + 2017 I > 0
2018 > 0
=> 3x > 0
=> x > 0
Ta có:
I x + 2016 I + I x + 2017 I + 2018 = 3x
<=> x + 2016 + x + 2017 + 2018 = 3x
<=> ( x + x ) + ( 2016 + 2017 + 2018 ) = 3x
<=> 2x + 6051 = 3x
=> x = 6051
Vậy x = 6051
Hok tốt