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\(\left(\dfrac{1}{7}\right)^7\cdot7^7\)
\(=\left(\dfrac{1}{7}\cdot7\right)^7\)
\(=\left(\dfrac{7}{7}\right)^7\)
\(=1^7\)
\(=1\)
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\(\dfrac{3^7}{\left(0,375\right)^7}\)
\(=\left(\dfrac{3}{0,375}\right)^7\)
\(=8^7\)
\(=\left(2^3\right)^7\)
\(=2^{21}\)
a) \({\left( {\frac{8}{9}} \right)^3} \cdot \frac{4}{3} \cdot \frac{2}{3} = {\left( {\frac{8}{9}} \right)^3}.\frac{8}{9} = {\left( {\frac{8}{9}} \right)^{3+1}}={\left( {\frac{8}{9}} \right)^4}\)
b) \({\left( {\frac{1}{4}} \right)^7} \cdot 0,25 = {\left( {0,25} \right)^7}.0,25 ={\left( {0,25} \right)^{7+1}}= {\left( {0,25} \right)^8}\)
c) \({( - 0,125)^6}:\frac{{ - 1}}{8} = {\left( {\frac{{ - 1}}{8}} \right)^6}:\frac{{ - 1}}{8} = {\left( {\frac{{ - 1}}{8}} \right)^{6-1}}= {\left( {\frac{{ - 1}}{8}} \right)^5}\)
d) \({\left[ {{{\left( {\frac{{ - 3}}{2}} \right)}^3}} \right]^2} = {\left( {\frac{{ - 3}}{2}} \right)^{3.2}} = {\left( {\frac{{ - 3}}{2}} \right)^6}\)
\(0,001=\frac{1}{1000}=\frac{1}{10^3}=10^{-3}\)
\(0,0001=\frac{1}{10000}=\frac{1}{10^4}=10^{-4}\)
\(0,00015=\frac{3}{20000}=\frac{3}{2}\times\frac{1}{10000}=\frac{3}{2}\times\frac{1}{10^4}=\frac{3}{2}\times10^{-4}\)
\(5^{-a}=\frac{1}{5^a}\)
\(3,5\times10^{-5}=3,5\times\frac{1}{10^5}\)
\(\left(\frac{2}{3}\right)^{-2}==\frac{1}{\left(\frac{2}{3}\right)^2}=\left(\frac{3}{2}\right)^2\)
\(10^{-3}=\frac{1}{10^3}=\frac{1}{1000}\)
a) \(7^5:343\)
\(=7^5:7^3\)
\(=7^{5-3}\)
\(=7^2\)
b) \(a^{12}:a^{18}\)
\(=\dfrac{a^{12}}{a^{18}}\)
\(=\dfrac{a^0}{a^6}\)
\(=\dfrac{1}{a^6}\)
c) \(x^7\cdot x^4\cdot x\)
\(=x^{7+4+1}\)
\(=x^{12}\)