Odpowiedź:
[tex]\huge\boxed {~~\dfrac{(5^{8}-3\cdot 5^{6})\div 2\frac{1}{5} }{2\cdot 5^{6}-5^{5}} =5\dfrac{5}{9} ~~}[/tex]
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[tex]\dfrac{(5^{8}-3\cdot 5^{6})\div 2\frac{1}{5} }{2\cdot 5^{6}-5^{5}} =\dfrac{(5^{2+6}-3\cdot 5^{6})\div \frac{11}{5} }{2\cdot 5^{1+5}-5^{5}} =\dfrac{(5^{2}\cdot 5^{6}-3\cdot 5^{6})\cdot \frac{5}{11} }{2\cdot 5^{1} \cdot 5^{5}-5^{5}} =\\\\\\=\dfrac{(25\cdot 5^{6}-3\cdot 5^{6})\cdot \frac{5}{11} }{10\cdot 5^{5}-5^{5}} =\dfrac{(5^{6}\cdot(25-3))\cdot \frac{5}{11} }{ 5^{5}(10-1)} =\dfrac{5^{6}\cdot 22\!\!\!\!\!\diagup^2\cdot \frac{5}{11\!\!\!\!\diagup_1} }{5^{5}\cdot 9} =[/tex]
[tex]=\dfrac{2\cdot 5^{6}\cdot 5^{1}}{9\cdot 5^{5}} =\dfrac{2}{9} \cdot \dfrac{5^{6+1}}{5^{5}} =\dfrac{2}{9} \cdot \dfrac{5^{7}}{5^{5}} =\dfrac{2}{9} \cdot 5^{7-5}=\dfrac{2}{9} \cdot 5^{2}=\dfrac{2}{9} \cdot 25=\\\\\\=\dfrac{50}{9} =5\dfrac{5}{9}[/tex]
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Odpowiedź:
[tex]\huge\boxed {~~\dfrac{(5^{8}-3\cdot 5^{6})\div 2\frac{1}{5} }{2\cdot 5^{6}-5^{5}} =5\dfrac{5}{9} ~~}[/tex]
Szczegółowe wyjaśnienie:
Korzystamy ze wzorów:
Pamiętamy o kolejności wykonywanych działań:
Obliczamy :
[tex]\dfrac{(5^{8}-3\cdot 5^{6})\div 2\frac{1}{5} }{2\cdot 5^{6}-5^{5}} =\dfrac{(5^{2+6}-3\cdot 5^{6})\div \frac{11}{5} }{2\cdot 5^{1+5}-5^{5}} =\dfrac{(5^{2}\cdot 5^{6}-3\cdot 5^{6})\cdot \frac{5}{11} }{2\cdot 5^{1} \cdot 5^{5}-5^{5}} =\\\\\\=\dfrac{(25\cdot 5^{6}-3\cdot 5^{6})\cdot \frac{5}{11} }{10\cdot 5^{5}-5^{5}} =\dfrac{(5^{6}\cdot(25-3))\cdot \frac{5}{11} }{ 5^{5}(10-1)} =\dfrac{5^{6}\cdot 22\!\!\!\!\!\diagup^2\cdot \frac{5}{11\!\!\!\!\diagup_1} }{5^{5}\cdot 9} =[/tex]
[tex]=\dfrac{2\cdot 5^{6}\cdot 5^{1}}{9\cdot 5^{5}} =\dfrac{2}{9} \cdot \dfrac{5^{6+1}}{5^{5}} =\dfrac{2}{9} \cdot \dfrac{5^{7}}{5^{5}} =\dfrac{2}{9} \cdot 5^{7-5}=\dfrac{2}{9} \cdot 5^{2}=\dfrac{2}{9} \cdot 25=\\\\\\=\dfrac{50}{9} =5\dfrac{5}{9}[/tex]