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|x-2016|2016+|x-2017|2016=1
|x-2016|2016=1 hoặc |x-2017|2016=1
th1:|x-2016|2016=1
|x-2016|2016=12016
x-2016=1
x=1+2016
x=2017
th2:
làm tương tự
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Ta có :
\(x=\frac{2016^{2017}+1}{2016^{2016}+1}\)
\(\frac{1}{2016}x=\frac{2016^{2017}+1}{2016^{2017}+2016}=\frac{2016^{2017}+2016-2015}{2016^{2017}+2016}\)
\(\Rightarrow\frac{1}{2006}x=1-\frac{2015}{2016^{2017}+2016}\)
Ta lại có :
\(y=\frac{2016^{2016}+1}{2016^{2015}+1}\)
\(\Rightarrow\frac{1}{2016}y=\frac{2016^{2016}+1}{2016^{2016}+2016}=\frac{2016^{2016}+2016-2015}{2016^{2016}+2016}\)
\(\Rightarrow\frac{1}{2016}y=1-\frac{2015}{2016^{2016}+2016}\)
Mà \(\frac{2015}{2016^{2017}+2016}< \frac{2015}{2016^{2016}+2016}\)(so sánh mẫu)
\(\Rightarrow1-\frac{2015}{2016^{2017}+2016}>1-\frac{2015}{2016^{2016}+2016}\)
\(\Rightarrow\frac{1}{2016}x>\frac{1}{2016}y\)
\(\Rightarrow x>y\)
DÀI QUÁ KHÔNG TÍNH ĐƯỢC. CÁI NÀY CÓ MÀ ĐI HỎI THẦN ĐỒNG VỀ MÔN TOÁN ĐI
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Nếu:
\(\dfrac{a}{b}< 1\Rightarrow\dfrac{a+m}{b+m}< 1\left(m\in N\right)\)
Ta có:
\(x=\dfrac{2016^{2017}+1}{2016^{2016}+1}< 1\)
\(\Rightarrow x< \dfrac{2016^{2017}+1+2015}{2016^{2016}+1+2015}\Rightarrow x< \dfrac{2016^{2017}+2016}{2016^{2016}+2016}\Rightarrow x< \dfrac{2016\left(2016^{2016}+1\right)}{2016\left(2016^{2015}+1\right)}\Rightarrow x< \dfrac{2016^{2016}+1}{2016^{2015}+1}=y\)
\(\Rightarrow x< y\)
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vì 2>0\(\Rightarrow|x-2014|+|x-2015|+|x-2016|>0\)
\(\Rightarrow|x-2014|+|x-2015|+|x-2016|\)
\(\Rightarrow x-2014+x-2015+x-2016=2\)
\(\Rightarrow x+x+x-2014-2015-2016=2\Rightarrow3x-6045=2\)
\(\Rightarrow3x=6047\Rightarrow x=6047:3=\frac{6047}{3}\)
bạn jj vừa trả lời ơi, cho mik hỏi tí là vì sao bn suy ra đc dòng 3
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\(\frac{x+1}{2019}+\frac{x+2}{2018}=\frac{x+3}{2017}+\frac{x+4}{2016}\)
\(\Leftrightarrow\left(\frac{x+1}{2019}-1\right)+\left(\frac{x+2}{2018}-1\right)=\left(\frac{x+3}{2017}-1\right)+\left(\frac{x+4}{2016}-1\right)\)
\(\Leftrightarrow\frac{x+2020}{2019}+\frac{x+2020}{2018}=\frac{x+2020}{2017}+\frac{x+2020}{2016}\)
\(\Leftrightarrow\left(x+2020\right)\left(\frac{1}{2019}+\frac{1}{2018}-\frac{1}{2017}-\frac{1}{2016}\right)=0\)
\(\Leftrightarrow x+2020=0:\left(\frac{1}{2019}+\frac{1}{2018}-\frac{1}{2017}-\frac{1}{2016}\right)\)
\(\Leftrightarrow x+2020=0\)
Còn lại tự làm :V
Lộn chỗ này , thay chút nha !
\(\Leftrightarrow\left(\frac{x+1}{2019}+1\right)+\left(\frac{x+2}{2018}+1\right)=\left(\frac{x+3}{2017}+1\right)+\left(\frac{x+4}{2016}+1\right)\)
Sorry =))
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(x-1)/2016 +(x-2)/2015 -(x-3)/2014 = (x-4)/2013. =>(x-1)/2016 +(x-2)/2015 = (x-3)/2014 + (x-4)/2013. =>. (X-1)/2016 -1 + (x-2)/2015 -1 = (x -3)/2014 -1 + (x-4)/2013 -1 => (x -2017)/2016 + (x-2017)/2015 -(x-2017)/2014 -(x-2017)/2013 =0. => (x-2017)(1/2016 +1/2015 -1/2014 -1/2013) = 0 => x-2017 =0 => x = 2017
Ta có: \(\frac{x-1}{2016}+\frac{x-2}{2015}-\frac{x-3}{2014}=\frac{x-4}{2013}\)
\(\Leftrightarrow\frac{x-1}{2016}+\frac{x-2}{2015}-\frac{x-3}{2014}-\frac{x-4}{2013}=0\)
\(\Leftrightarrow\left(\frac{x-1}{2016}-1\right)+\left(\frac{x-2}{2015}-1\right)-\left(\frac{x-3}{2014}-1\right)-\left(\frac{x-4}{2013}-1\right)=0\)
\(\Leftrightarrow\frac{x-2017}{2016}+\frac{x-2017}{2015}-\frac{x-2017}{2014}-\frac{x-2017}{2013}=0\)
\(\Leftrightarrow\left(x-2017\right)\left(\frac{1}{2016}+\frac{1}{2015}-\frac{1}{2014}-\frac{1}{2013}\right)=0\)
Mà \(\frac{1}{2016}+\frac{1}{2015}-\frac{1}{2014}-\frac{1}{2013}\ne0\) nên \(x-2017=0\Leftrightarrow x=2017\)
Tiến Dũng Đinh:sai rùi,đáp án vô hạn,giả sử x=2016 TM
x=\(2016^{2016}\) cũng TM.........
Nhưng mình ko biết cách làm
x=0 hoặc 2016 đó