5.3\(^{x+2}\) -5=2\(^4\) .5\(^2\)
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5.3x = 5.34
=> x = 4
5.34 = 7.35 - 2.35
= 35 . (7 - 2)
= 5. 35
=> 3x = 35
=> x = 5
c, \(5^{x+4}-3\cdot5^{x+3}=2\cdot5^{11}\)
\(\Leftrightarrow5^{x+3}\cdot5-3\cdot5^{x+3}=2\cdot5^{11}\)
\(\Leftrightarrow5^{x+3}\left(5-3\right)=2\cdot5^{11}\)
\(\Leftrightarrow5^{x+3}\cdot2=2\cdot5^{11}\)
\(\Leftrightarrow5^{x+3}=5^{11}\)
\(\Leftrightarrow x+3=11\)
\(\Leftrightarrow x=8\)
Vậy x = 8
d, \(2^x+2^{x+1}+2^{x+2}+2^{x+3}+2^{x+4}+2^{x+5}=480\)
\(\Leftrightarrow2^x\left(1+2+2^2+2^3+2^4+2^5\right)=480\)
\(\Leftrightarrow2^x\cdot63=480\)
\(\Leftrightarrow2^x=\frac{160}{21}\)
\(\Leftrightarrow x\approx2,93\)
1; 5.22 + (\(x\) + 3) = 52
5.4 + (\(x\) + 3) = 25
20 + (\(x\) + 3) = 25
\(x\) + 3 = 25 - 20
\(x+3\) = 5
\(x\) = 5 - 3
\(x\) = 2
Vậy \(x=2\)
2; 23 + (\(x\) - 32) = 53 - 43
8 + (\(x\) - 9) = 125 - 64
8 + (\(x\) - 9) = 61
\(x\) - 9 = 61 - 8
\(x\) - 9 = 53
\(x\) = 53 + 9
\(x\) = 62
Vậy \(x\) = 62
\(6^2-\left(x+3\right)=45\)
\(36-\left(x+3\right)=45\)
\(x+3=35-45\)
\(x+3=-10\)
\(x=-13\)
5^4-3/100=1/20
3^3+2+1/3*13=3^5/13
5.3^7-5/5.3^5-3=1
2^15+14+13/2^13+12+11=2^6
\(5\cdot3^{x+2}-5=2^4\cdot5^2\)
\(\Rightarrow5\left(3^{x+2}-1\right)=2^4\cdot5^2\)
\(\Rightarrow3^{x+2}-1=\dfrac{2^4\cdot5^2}{5}\)
\(\Rightarrow3^{x+2}-1=16\cdot5\)
\(\Rightarrow3^{x+2}-1=80\)
\(\Rightarrow3^{x+2}=80+1\)
\(\Rightarrow3^{x+2}=81\)
\(\Rightarrow3^{x+2}=3^4\)
\(\Rightarrow x+2=4\)
\(\Rightarrow x=2\)
Vậy: x = 2
\(5\cdot3^{x+2}-5=2^4\cdot5^2\\\Rightarrow 5\cdot(3^{x+2}-1)=5\cdot(2^4\cdot5)\\\Rightarrow3^{x+2}-1=2^4\cdot5\\\Rightarrow3^{x+2}-1=16\cdot5\\\Rightarrow3^{x+2}-1=80\\\Rightarrow3^{x+2}=80+1\\\Rightarrow3^{x+2}=81\\\Rightarrow3^{x+2}=3^4\\\Rightarrow x+2=4\\\Rightarrow x=4-2\\\Rightarrow x=2\\Vậy:x=2\)