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\(\frac{x+4}{2010}+\frac{x+3}{2011}=\frac{x+2}{2012}+\frac{x+1}{2013}\)
\(\Leftrightarrow\left(\frac{x+4}{2010}+1\right)+\left(\frac{x+3}{2011}+1\right)=\left(\frac{x+2}{2012}+1\right)+\left(\frac{x+1}{2013}+1\right)\)
\(\Leftrightarrow\frac{x+2014}{2010}+\frac{x+2014}{2011}=\frac{x+2014}{2012}+\frac{x+2014}{2013}\)
\(\Leftrightarrow\frac{x+2014}{2010}+\frac{x+2014}{2011}-\frac{x+2014}{2012}-\frac{x+2014}{2013}=0\)
\(\Leftrightarrow\left(x+2014\right)\left(\frac{1}{2010}+\frac{1}{2011}-\frac{1}{2012}-\frac{1}{2013}\right)=0\)
\(\Leftrightarrow x+2014=0\)
\(\Leftrightarrow x=-2014\)
V...
2012(x + y) = 2013(y + z) = 2014 (z + x)
\(=\frac{x+y}{\frac{1}{2012}}=\frac{y+z}{\frac{1}{2013}}=\frac{z+x}{\frac{1}{2014}}\)
Áp dụng tính chất của dãy tỉ số = nhau ta có:
\(\frac{x+y}{\frac{1}{2012}}=\frac{y+z}{\frac{1}{2013}}=\frac{z+x}{\frac{1}{2014}}=\frac{\left(z+x\right)-\left(y+z\right)}{\frac{1}{2014}-\frac{1}{2013}}=\frac{\left(y+z\right)-\left(x+y\right)}{\frac{1}{2013}-\frac{1}{2012}}\)
\(=\frac{x-y}{\frac{-1}{2013.2014}}=\frac{z-x}{\frac{-1}{2012.2013}}\)
= (x - y).(-2013.2014) = (z - x).(-2012.2013)
=> (x - y).(-2013.2014).\(\frac{-1}{2013.2014.1006}\) = (z - x).(-2012.2013).\(\frac{-1}{2013.2014.1006}\)
\(\Rightarrow\frac{x-y}{1006}=\frac{z-x}{1007}\left(đpcm\right)\)
ta có
|x-2012|=1=>x-2012=1=>x=2013
|2013-y|=1=>2013-y=1=>y=2012
k
Đặt \(\frac{x}{2012}=\frac{y}{2013}=\frac{z}{2014}=k\)=> \(\hept{\begin{cases}x=2012k\\y=2013k\\z=2014k\end{cases}}\)
khi đó, ta có: (x - z)3 = (2012k - 2014k)3 = (-2k)3 = -8k3
8(x - y)2(y - z) = 8(2012k - 2013k)2(2013 - 2014k) = 8(-k)2.(-k) = -8k3
=> (x - z)3 = 8(x - y)2(y - z)
\(\left(2x-y+7\right)^{2012}+\left|x-3\right|^{2013}\le0\)
Vì \(\left(2x-y+7\right)^{2012}\ge0\forall x;y\)và \(\left|x-3\right|\ge0\Leftrightarrow\left|x-3\right|^{2013}\ge0\forall x\)
\(\Rightarrow\left(2x-y+7\right)^{2012}+\left|x-3\right|^{2013}=0\)
Dấy "=" xảy ra \(\Leftrightarrow\hept{\begin{cases}2x-y+7=0\\x-3=0\end{cases}\Leftrightarrow\hept{\begin{cases}y=13\\x=3\end{cases}}}\)
Vậy....
Xét x < 2012 ta có :
2012 - x + 2013 - x = 2014 <=> 4025 - 2x = 2014 <=> 2x = 2011 => x = 1005,5
Xét 2012 ≤ x < 2013 ta có :
x - 2012 + 2013 - x = 2014 <=> 1 = 2014 ( loại )
Xét x ≥ 2013 ta có :
x - 2012 + x - 2013 = 2014 <=> 2x - 4025 = 2014 <=> 2x = 6039 => x = 3019,5
Vậy x = { 1005,5 ; 3019,5 }
x = 3019,5