a) \(4\dfrac{1}{3}:\dfrac{x}{4}=6:0,3\)
\(\dfrac{13}{3}:\dfrac{x}{4}=20\)
\(\dfrac{x}{4}=\dfrac{13}{3}:20\)
\(\dfrac{x}{4}=\dfrac{13}{3}\cdot\dfrac{1}{20}\)
\(\dfrac{x}{4}=\dfrac{13}{60}\)
\(x=\dfrac{13}{60}\cdot4\)
Vậy \(x=\dfrac{13}{15}\)
b)\(2^3:4.2^{\left(x+1\right)}=64\)
\(8:4.2^{\left(x+1\right)}=64\)
\(2.2^{\left(x+1\right)}=64\)
\(2\cdot2^x.2=64\)
\(4.2^x=64\)
\(2^x=64:4\)
\(2^x=16\)
\(2^x=2^4\)
Vậy \(x=4\)
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Tìm x
a) x= \(\frac{13}{15}\)
b) x= 4
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