Matma.! Pliska.! Na jutro.! Oblicz : a) 1 i 1/5 * 1 i 2/3 * 1/7 + (1 i 1/7) do potęgi drugiej :)    b) ( 2 i 1/6 - 2/3 ) do potęgi drugiej - 2 i 1/5.   Z góry Dziękuję.! :)))

1 1/5 * 1 2/3 * 1/7 + (1 1/7)^2 = 6/5 * 5/3 * 1/7 + (8/7)^2 = 2/7 + 64/49 = 14/49+64/49 = 78/49 = 1 29/49 (2 1/6 - 2/3)^2 - 2 1/5 = (13/6 - 4/6)^2 - 11/5 = 81/36 - 11/5 = 405/180 - 396/180 = 9/180 = 1/20

1 frac{1}{5} * 1 frac{1}{3} * frac{1}{7} + (1 frac{1}{7}) ^{2} = frac{6}{5} * frac{5}{3} * frac{1}{7} + ( frac{8}{7})^2 = frac{2}{7} + frac{64}{49} = frac{14}{49} + {64}{49}= frac {78}{49} = 1 frac {29}{49} [latex](2 frac{1}{6} - frac{2}{3})^2 - 2frac{1}{5} = ( frac{13}{6} - frac{4}{6})^2 - frac{11}{5} = (frac{9}{6})^2 - frac{11}{5} = ( frac{3}{2})^2 - frac{11}{5} = frac{9}{4} - frac{11}{5} = frac{45}{20} - frac{44}{20} = frac{1}{20} [/latex]