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\(3^{x+1}\) + \(3^{x+2}\) = 324
\(3^x\) . 3 + \(3^x\) . 9 = 324
\(3^x\) . ( 3 + 9 ) = 324
\(3^x\) . 12 = 324
\(3^x\) = 324 :12
\(3^x\) = 27
\(3^x\) = \(3^3\)
x = 3
3x+1 + 3x+2 = 324
3x . 3 + 3x . 32 = 324
3x . ( 3 + 32 ) = 324
3x . 12 = 324
3x = 324 : 12
3x = 27
3x = 33
=> x = 3
Vậy x = 3

Ta có: \(3^{x+3}\cdot3^{2x-1}+3^{2x}\cdot3^{x+1}=324\)
\(\Leftrightarrow3^{3x+2}+3^{3x+1}=324\)
\(\Leftrightarrow3^{3x+1}\cdot\left(3+1\right)=324\)
\(\Leftrightarrow3^{3x+1}\cdot4=324\)
\(\Leftrightarrow3^{3x+1}=81=3^4\)
\(\Rightarrow3x+1=4\)
\(\Leftrightarrow x=1\)
\(3^{x+3}\cdot3^{2x-1}+3^{2x}\cdot3^{x+1}=324\)
\(3^{x+3+2x-1}+3^{2x+x+1}=324\)
\(3^{3x+2}+3^{3x+1}=324\)
\(3^{3x+1}\cdot\left(3+1\right)=324\)
\(3^{3x+1}\cdot4=324\)
\(3^{3x+1}=324:4\)
\(3^{3x+1}=81\)
\(3^{3x+1}=3^4\)
\(\Rightarrow3x+1=4\)
\(3x=4-1\)
\(3x=3\)
\(x=3:3\)
\(x=1\)

3x+2=369
=>x+2=69
x=69-2
x=67
2x-5=810
2x-5=230
=>x-5=30
x=30+5
x=35
3x+2+3x=810
3x.32+3x=810
3x.(32+1)=810
3x.10=810
3x=810:10
3x=81
3x=34
=>x=4
5x+1-5x=500
5x.5-5x=500
5x.(5-1)=500
5x.4=500
5x=500:4
5x=125
5x=53
=>x=3
a) 3x+2 = 369
x + 2 = 69
x = 69 - 2
x = 67
b) 2x-5 = 810
2x-5 = 230
x - 5 = 30
x = 30 + 5
x = 35
c) 3x+2 + 3x = 810
3x . 9 + 3x . 1 = 810
3x . ( 9 + 1 ) = 810
3x . 10 = 810
3x = 810 : 10
3x = 81
3x = 34
=> x = 4
d) 5x+1 - 5x = 500
5x . 5 - 5x . 1 = 500
5x . ( 5 - 1 ) = 500
5x . 4 = 500
5x = 500 : 4
5x = 125
5x = 53
=> x = 3

a) \(3^{x+1}=729\)\(\Leftrightarrow3.3^x=729\Rightarrow3^x=243\Rightarrow3^x=3^5\Rightarrow x=5\)
b) \(2^x+2^{x+1}+2^{x+3}=704\Rightarrow2^x+2^x.2+2^x.2^3=704\Rightarrow2^x\left(1+2+8\right)=704\)
\(\Rightarrow2^x.11=704\Rightarrow2^x=64\Rightarrow2^x=2^5\Rightarrow x=5\)

\(2^{x+4}+2^{x+3}+2^{x+2}+2^{x+1}=1920\)
\(15.2^{x+1}=1920\)
\(2^{x+1}=1920:15\)
\(2^{x+1}=128\)
\(2^{x+1}=2^7\)
\(x+1=7\)
\(x=7-1\)
\(x=6\)
=> x = 6

a) \(\frac{9}{20}\) c) \(\frac{-55}{4}\)
b) \(\frac{116}{75}\) d) \(\frac{-76}{45}\)
đúng hết đấy nhé mình tính kĩ lắm ko sai đâu
chúc may mắn
\(3^{x+1}+3^{x+2}=324\)
\(\Rightarrow3^x.3^1+3^x.3^2=324\)
\(3^x\left(3+9\right)=324\)
\(3^x.12=324\)
\(\Rightarrow3^x=324:12\)
\(\Rightarrow3^x=27\)
\(3^x=3^3\)
\(\Rightarrow x=3\)
Vậy x = 3