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\(3^x+3^{x+2}=\left(-3\right)^3.\left(-10\right)\\ \Leftrightarrow3^x+9.3^x=270\\ \Leftrightarrow10.3^x=270\\ \Leftrightarrow3^x=27\\ \Leftrightarrow3^x=3^3\\ \Leftrightarrow x=3\)
\(\Rightarrow3^x\left(1+3^2\right)=3^3\cdot10\\ \Rightarrow3^x\cdot10=3^3\cdot10\\ \Rightarrow x=3\)
(2¹⁷ + 17²) . (9¹⁵ - 3¹⁵) . (2⁴ - 4²)
= (2¹⁷ + 17²) . (9¹⁵ - 3¹⁵) . (16 - 16)
= (2¹⁷ + 17²) . (9¹⁵ - 3¹⁵) . 0
= 0
\(\dfrac{1}{2}\left(x-2\right)+\dfrac{1}{3}\left(2-x\right)=x\\ \Leftrightarrow\dfrac{1}{2}\left(x-2\right)-\dfrac{1}{3}\left(x-2\right)=x\\ \Leftrightarrow\left(x-2\right).\left(\dfrac{1}{2}-\dfrac{1}{3}\right)=x\\ \Leftrightarrow\left(x-2\right).\left(\dfrac{3-2}{6}\right)=x\\ \Leftrightarrow\left(x-2\right).\dfrac{1}{6}=x\\ \Leftrightarrow\dfrac{1}{6}x-\dfrac{1}{3}-x=0\\ \Leftrightarrow\left(\dfrac{1}{6}-1\right)x=\dfrac{1}{3}\\ \Leftrightarrow\left(\dfrac{1-6}{6}\right)x=\dfrac{1}{3}\\ \Leftrightarrow\dfrac{-5}{6}x=\dfrac{1}{3}\\ \Leftrightarrow x=\dfrac{1}{3}:\left(-\dfrac{5}{6}\right)\\ \Leftrightarrow x=-\dfrac{2}{5}\)
Vậy \(x=-\dfrac{2}{5}\)
y \(\times\) 2 +\(\dfrac{y}{\dfrac{1}{3}}\) = 20
\(y\times2+y\div\dfrac{1}{3}=20\)
\(y\times2+y\times3=20\)
\(y\times\left(2+3\right)=20\)
\(y\times5=20\)
\(y=20\div5\)
\(y=4\)
A = 1 + 2 + 22 + 23 + 24 + ..... + 22021
2A = 2 + 22 + 23 + 24 + 25 + ..... + 22022
2A - A = ( 2 + 22 + 23 + 24 + 25 + ..... + 22022 ) - ( 1 + 2 + 22 + 23 + 24 + ..... + 22021 )
A = 22022 - 1
\(\left(x-2\right)^5-\left(x-2\right)^3=0\)
\(\Rightarrow\left(x-2\right)^3\left(\left(x-2\right)^2-1\right)=0\)
\(\Rightarrow\left[{}\begin{matrix}x-2=0\\\left(x-2\right)^2-1=0\end{matrix}\right.\)
\(\Rightarrow\left[{}\begin{matrix}x=2\\\left(x-2\right)^2=1\end{matrix}\right.\)
\(\Rightarrow\left[{}\begin{matrix}x=2\\x-2=1\\x-2=-1\end{matrix}\right.\)
\(\Rightarrow\left[{}\begin{matrix}x=2\\x=3\\x=1\end{matrix}\right.\)
Vậy \(x\in\left\{1;2;3\right\}\)
⇒ ( x - 2)3 . (x - 2)2 - (x - 2)3 . 1 = 0 ⇒ ( x - 2)3 . [( x - 2)2 - 1] = 0
a)\(=>x=\left(-\dfrac{1}{2}+\dfrac{1}{4}\right):2=-\dfrac{1}{8}\)
a) \(2x-\dfrac{1}{4}=\dfrac{-1}{2}\)
\(2x=\dfrac{-1}{2}+\dfrac{1}{4}\)
\(2x=-\dfrac{1}{4}\)
\(x=-\dfrac{1}{4}\div2\)
\(x=-\dfrac{1}{8}\)
b) \(\dfrac{13}{3}-\dfrac{1}{3}\cdot\left(x+1\right)=\dfrac{4}{3}\)
\(\dfrac{1}{3}\cdot\left(x+1\right)=\dfrac{13}{3}-\dfrac{4}{3}\)
\(\dfrac{1}{3}\cdot\left(x+1\right)=3\)
\(x+1=3\div\dfrac{1}{3}\)
\(x+1=9\)
\(x=9-1\)
\(x=8\)
\(\left(3x+2\right)^3=11.121=11.11^2=11^3\\ Nên:3x+2=11\\ Vậy:3x=11-2=9\\ Vậy:x=\dfrac{9}{3}=3\)
\(\left(3x+2\right)^3=11\cdot121\)
\(\Rightarrow\left(3x+2\right)^3=11^3\)
\(\Rightarrow3x+2=11\)
\(\Rightarrow3x=11-2\)
\(\Rightarrow3x=9\)
\(\Rightarrow x=\dfrac{9}{3}\)
\(\Rightarrow x=3\)