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\(10+2\cdot x=4^5:4^3\)
\(\Rightarrow10+2\cdot x=4^{5-3}\)
\(\Rightarrow10+2\cdot x=4^2\)
\(\Rightarrow10+2\cdot x=16\)
\(\Rightarrow2\cdot x=16-10\)
\(\Rightarrow2\cdot x=6\)
\(\Rightarrow x=\dfrac{6}{2}=3\)
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\(2\cdot x-6^2:18=3\cdot2^2\)
\(\Rightarrow2\cdot x-36:18=12\)
\(\Rightarrow2\cdot x-2=12\)
\(\Rightarrow2\cdot x=12+2\)
\(\Rightarrow2\cdot x=14\)
\(\Rightarrow x=\dfrac{14}{2}=7\)
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\(70-5\cdot\left(x-3\right)=3\cdot2\)
\(\Rightarrow70-5\cdot\left(x-3\right)=6\)
\(\Rightarrow70-5x+15=6\)
\(\Rightarrow-5x+15=6-70\)
\(\Rightarrow-5x+15=64\)
\(\Rightarrow-5x=64-15\)
\(\Rightarrow-5x=49\)
\(\Rightarrow x=-\dfrac{49}{5}\)
\(\Rightarrow\left(x+x+x+x\right)+\left(3,2+1,8+1,7+2,3\right)=25,2\)
\(\Rightarrow4x+9=25,2\)
\(\Rightarrow4x=16,2\Rightarrow x=4,05\)
\(\Leftrightarrow\dfrac{3\cdot2^{x+1}}{2^{x+3}}=40\\ \Leftrightarrow\dfrac{3}{2^2}=40\left(vô.lí\right)\Leftrightarrow x\in\varnothing\)
1/5.2^x+1/3.2^x.2=1/5.2^7+1/3.2^7.2
2x(1/5+1/3.2)=2^7(1/5+1/3.2)
=>2^x=2^7
=> x=7
3\(x\) - 42 = 3.23
3\(x\) - 42 = 3.8
3\(x\) - 42 = 24
3\(x\) = 24 + 42
3\(x\) = 66
\(x\) = 66: 3
\(x\) = 22
3x - 42 = 3 . 23
3x - 42 = 3 . 8
3x - 42 = 24
3x = 24 + 42
3x = 66
x = 66 : 3
=> x = 22.
3.2 + 2x+3 = 44
6 + 2x+3 = 44
2x+3 = 38
2x . 23 = 38
2x . 8 = 38
2x = 38 : 8 = 4,25
=> x = ???
1) \(-\frac{2}{3}\left(x-\frac{1}{4}\right)=\frac{1}{3}\left(2x-1\right)\)
\(-\frac{2}{3}x+\frac{1}{6}=\frac{2}{3}x-\frac{1}{3}\)
\(-\frac{2}{3}x-\frac{2}{3}x=-\frac{1}{3}-\frac{1}{6}\)
\(-\frac{4}{3}x=-\frac{1}{2}\)
\(x=\left(-\frac{1}{2}\right):\left(-\frac{4}{3}\right)\)
\(x=\frac{3}{8}\)
3.2^x=768
2^x=768:3
2^x=256
2^x=2^8
chúc bn hk tốt ~~~
2^x = 768 ÷ 3
2^x = 256
2^x = 2^8
X = 8