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\(a,\Leftrightarrow y^{200}-y=y\left(y^{199}-1\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}y=0\\y^{199}=1\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}y=0\\y=1\end{matrix}\right.\)
Vậy ..
\(b,\Leftrightarrow y^{2010}-y^{2008}=y^{2008}\left(y^2-1\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}y^{2008}=0\\y^2=1\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}y=0\\y=1\\y=-1\end{matrix}\right.\)
Vậy ...
\(c,\Leftrightarrow\left(2y-1\right)^{50}-\left(2y-1\right)=\left(2y-1\right)\left(\left(2y-1\right)^{49}-1\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}2y-1=0\\\left(2y-1\right)^{49}=1\end{matrix}\right.\)
\(\Leftrightarrow y=\dfrac{1}{2}\)
Vậy ..
\(d,\Leftrightarrow\left(\dfrac{y}{3}-5\right)^{2008}\left(\left(\dfrac{y}{3}-5\right)^2-1\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}\left(\dfrac{y}{3}-5\right)^{2008}=0\\\left(\dfrac{y}{3}-5\right)^2=1\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}\dfrac{y}{3}-5=0\\\dfrac{y}{3}-5=1\\\dfrac{y}{3}-5=-1\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}y=15\\y=18\\y=12\end{matrix}\right.\)
Vậy ..
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A=1+52+54+...+5200
52A=52+54+...+5202
52A+1=1+52+54+...+5200+5202=A+5202
25A-A=5202-1
24A=5202-1
A = \(\frac{5^{202}-1}{24}\)
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a) y^200 = y
\(\Leftrightarrow\orbr{\begin{cases}y=1\\y=0\end{cases}}\)
b) y^2008 = y^2010
\(\Leftrightarrow\orbr{\begin{cases}y=1\\y=0\end{cases}}\)
c) (2y - 1)^50 = 2y - 1
\(\Leftrightarrow\orbr{\begin{cases}2y-1=1\\2y-1=0\end{cases}}\Leftrightarrow\orbr{\begin{cases}y=1\\y=\frac{1}{2}\end{cases}}\)
d) (y/3 - 5)^2000= y/3 -5
\(\Leftrightarrow\orbr{\begin{cases}\frac{y}{3}-5=1\\\frac{y}{3}-5=0\end{cases}}\Leftrightarrow\orbr{\begin{cases}y=18\\y=15\end{cases}}\)
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Ta có \(\left(x-\dfrac{2}{7}\right)^{2008}\ge0\) với mọi x
\(\left(0,2-\dfrac{1}{5}y\right)^{2010}\ge0\) với mọi y
\(\left(-1\right)^{200}=1\)
\(\Rightarrow N=\left(x-\dfrac{2}{7}\right)^{2008}+\left(0,2-\dfrac{1}{5}y\right)^{2010}+\left(-1\right)^{200}\ge1\)
Dấu bằng xảy ra : \(\Leftrightarrow\left\{{}\begin{matrix}\left(x-\dfrac{2}{7}\right)^{2008}=0\\\left(0,2-\dfrac{1}{5}y\right)^{2010}=0\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}x-\dfrac{2}{7}=0\\0,2-\dfrac{1}{5}y=0\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}x=\dfrac{2}{7}\\\dfrac{1}{5}y=0,2\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}x=\dfrac{2}{7}\\y=1\end{matrix}\right.\)
Vậy Nmin = 1 \(\Leftrightarrow\left\{{}\begin{matrix}x=\dfrac{2}{7}\\y=1\end{matrix}\right.\)
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