2. Найдите значение выражений a) 11 11 3 7 5 + e) 5 3 26 9 13 19 19 6) +(8-3); ж)-42; 3 4 8 7 36 8 и)9:; к)1:; 5 17 8 21 4 3 32 5 л): 36. д) 56 7 9 27

a) $$\\\\frac{5}{11} + \\\\frac{3}{11} + \\\\frac{7}{11} = \\\\frac{5+3+7}{11} = \\\\frac{15}{11} = 1\\\\frac{4}{11}$$

б) $$\\\\frac{9}{19} + (8 - 3\\\\frac{18}{19}) = \\\\frac{9}{19} + (7\\\\frac{19}{19} - 3\\\\frac{18}{19}) = \\\\frac{9}{19} + 4\\\\frac{1}{19} = \\\\frac{9}{19} + \\\\frac{77}{19} = \\\\frac{86}{19} = 4\\\\frac{10}{19}$$

е) $$5\\\\frac{3}{26} = \\\\frac{5 \\\\cdot 26 + 3}{26} = \\\\frac{130 + 3}{26} = \\\\frac{133}{26} = 5\\\\frac{3}{26}$$

ж) $$\-42 = - \\\\frac{42}{1} = -42$$

и) $$9 : \\\\frac{3}{4} = 9 \\\\cdot \\\\frac{4}{3} = \\\\frac{9 \\\\cdot 4}{3} = \\\\frac{36}{3} = 12$$

к) $$1 : \\\\frac{8}{17} = 1 \\\\cdot \\\\frac{17}{8} = \\\\frac{17}{8} = 2\\\\frac{1}{8}$$

л) $$\frac{4}{9} : 36 = \\\\frac{4}{9} \\\\cdot \\\\frac{1}{36} = \\\\frac{4}{324} = \\\\frac{1}{81}$$

д) $$\frac{27}{56} : \\\\frac{3}{7} = \\\\frac{27}{56} \\\\cdot \\\\frac{7}{3} = \\\\frac{27 \\\\cdot 7}{56 \\\\cdot 3} = \\\\frac{189}{168} = \\\\frac{9}{8} = 1\\\\frac{1}{8}$$

Ответ: a) $$1\\frac{4}{11}$$; б) $$4\\frac{10}{19}$$; e) $$5\\frac{3}{26}$$; ж) -42; и) 12; к) $$2\\frac{1}{8}$$; л) $$\\\\frac{1}{81}$$; д) $$1\\frac{1}{8}$$