Salut!
[tex][(\frac{5}{11})^3]^{15} \cdot (\frac{5}{11} )^{20} \div (\frac{5}{11})^{65} =[/tex]
[tex](\frac{5}{11})^{45} \cdot (\frac{5}{11})^{20} \div (\frac{5}{11})^{65} =[/tex]
[tex](\frac{5}{11} )^{45+20-65}=[/tex]
[tex](\frac{5}{11})^{0} =[/tex]
[tex]= 1[/tex]
Formule de calcul folosite:
[tex](\frac{x}{y} )^{-n} = (\frac{y}{x})^n[/tex]
[tex]a^x + a^y = a^{x+y}[/tex]
[tex]b^m - b^n = b^{m-n}[/tex]
[tex](\frac{x}{y} )^n = \frac{x^n}{y^n}[/tex]
