[tex]1)~x= \frac{5}{3}~si~y= \frac{2}{3} \\ \\ a)~x^{-1} = (\frac{5}{3})^{-1} = \frac{3}{5} \\ \\b)~x+y= \frac{5}{3} + \frac{2}{3} = \frac{5+2}{3}= \frac{7}{3} \\ \\ c)~y-x = \frac{2}{3} - \frac{5}{3} = \frac{2-5}{3} = \frac{-3}{3} = -1 \\ \\ d)~y^{3} = ( \frac{2}{3})^{3} = \frac{8}{27} [/tex]
[tex]2)~u=- \frac{8}{9}~si~v=- \frac{5}{6} \\ \\ a)~!u!=~! -\frac{8}{9} ! = \frac{8}{9} \\ \\ b)~u*v = (- \frac{8}{9})*(- \frac{5}{6})~se~fac~simplificarile~necesare~si~rezulta \\ \\ u*v = \frac{20}{27} \\ \\ c) ~v:u= \frac{v}{u} = \frac{ -\frac{5}{6} }{ -\frac{8}{9} } = \frac{5}{6} * \frac{9}{8} = \frac{15}{16} \\ \\ d)~v^{2}= ( -\frac{5}{6})^{2} = \frac{25}{36} [/tex]
Sper ca te-am ajutat!
