Tìm x :
3x + 3x+1 = 324
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`#3107.101107`
a)
\(5\left(x-1\right)^3=40\\\Rightarrow\left(x-1\right)^3=40\div5\\ \Rightarrow\left(x-1\right)^3=8\\ \Rightarrow\left(x-1\right)^3=2^3\\ \Rightarrow x-1=2\\ \Rightarrow x=2+1\\ \Rightarrow x=3\)
Vậy, `x = 3`
b)
\(3^{2x+1}+9^x=324?\\ \Rightarrow3^{2x}\cdot3+3^{2x}=324\\ \Rightarrow3^{2x}\cdot\left(3+1\right)=324\\ \Rightarrow3^{2x}\cdot4=324\\ \Rightarrow3^{2x}=81\\ \Rightarrow3^{2x}=3^4\\ \Rightarrow2x=4\\ \Rightarrow x=2\)
Vậy, `x = 2`
c)
\(5^x-13=3\cdot2^2\\ \Rightarrow5^x-13=12\\ \Rightarrow5^x=12+13\\ \Rightarrow5^x=25\\ \Rightarrow5^x=5^2\\ \Rightarrow x=2\)
Vậy, `x = 2`
d)
\(8^x+2^{3x+1}=192\\ \Rightarrow2^{3x}+2^{3x}\cdot2=192\\ \Rightarrow2^{3x}\left(1+2\right)=192\\ \Rightarrow2^{3x}\cdot3=192\\ \Rightarrow2^{3x}=64\\ \Rightarrow2^{3x}=2^6\\ \Rightarrow3x=6\\ \Rightarrow x=2\)
Vậy, `x = 2.`
a) 32x + 32x+1 = 324
32x . 1 + 32x . 3 = 324
32x . ( 1 + 3 ) = 324
32x . 4 = 324
32x = 324 : 4
32x = 81
32x = 34
=> 2x = 4
=> x = 4 : 2 = 2
( 3x - 7 )2012 = ( 3x - 7 )2014
( 3x - 7 )2014 - ( 3x - 7 )2012 = 0
( 3x - 7 )2012 . [ ( 3x - 7 )2 - 1 ] = 0
\(\Rightarrow\orbr{\begin{cases}\left(3x-7\right)^{2012}=0\\\left(3x-7\right)^2-1=0\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}3x-7=0\\\left(3x-7\right)^2=1\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}3x=7\\3x-7=1\text{ hoặc }3x-7=-1\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=\frac{7}{3}\\3x=8\text{ hoặc }3x=6\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=\frac{7}{3}\\x=\frac{8}{3}\text{ hoặc }x=2\end{cases}}\)
+) \(24+\left(x-6\right)=135\)
\(\Rightarrow x-6=135-24=111\)
\(\Rightarrow x=111+6=117\)
+) \(2019-2\cdot\left(3x-2\right)=19\)
\(\Rightarrow2\cdot\left(3x-2\right)=2019-19=2000\)
\(\Rightarrow3x-2=2000:2=1000\)
\(\Rightarrow3x=1000+2=1002\)
\(\Rightarrow x=1002:3\)
\(\Rightarrow x=334\)
+) \(3^x+3^{x+1}=324\)
\(\Rightarrow3^x+3^x\cdot3=324\)
\(\Rightarrow3^x\cdot\left(1+3\right)=324\)
\(\Rightarrow3^x\cdot4=324\) \(\Rightarrow3^x=324:4=81\)
\(\Rightarrow3^x=3^4\) \(\Rightarrow x=4\)
3x + 3x + 1 = 324
(3 + 3 ). x = 324 - 1
6x = 323
x = 323 : 6
x = \(\frac{323}{6}\)= \(53\frac{5}{6}\)
có 3x+3x+1=324
=>3x+3x=324-1
=>3x+3x=323
=>2.3x=323
=>6x=323
=>x=\(\frac{323}{6}\)
0,36 x 550 + 0,18 x 126 x 2 + 3 x 324 x 0,12
= 0,36 x 550 + 0,18 x 2 x 126 + 3 x 0,12 x 324
= 0,36 x 550 + 0,36 x 126 + 0,36 x 324
= 0,36 x ( 550 + 126 + 324 )
= 0,36 x 1000
= 360
Ta có : 0,36 x 550 + 0,18 x 126 x 2 + 3 x 324 x 0,12
= 0,36 x 550 + 0,36 x 126 + 0,36 x 324
= 0,36 x ( 550 + 126 + 324 )
= 0,36 x 950
= 162
\(3^x\cdot4=324\)
\(\Leftrightarrow3^x=\dfrac{324}{4}=81\)
\(\Leftrightarrow3^x=3^4\)
\(\Rightarrow x=4\)
Vậy \(x=4\)
\(3^x\cdot4=324\)
\(\Rightarrow3^x=324:4\)
\(\Rightarrow3^x=81\)
\(\Rightarrow3^x=3^4\)
\(\Rightarrow x=4\)
<=> 3^x(3+1)=324 <=> 3^x * 4 = 324 <=> 3^x = 81 <=> 3^x = 3^4 <=> x=4
Vậy x=4
3x + 3x + 1 = 324
3x + 3x.3 = 81.4
3x.4 = 34.4
x = 4