4 Вычисли: a) 1 1 + 3 2= = 5 5 б) 127-4 5= = г) 96-4 = 9 9 8 B) 2 3 + 7 =

Вычислим:

a) $$1\frac{1}{5} + 3\frac{2}{5} = (1+3) + (\frac{1}{5} + \frac{2}{5}) = 4 + \frac{3}{5} = 4\frac{3}{5}$$

б) $$12\frac{7}{9} - 4\frac{5}{9} = (12-4) + (\frac{7}{9} - \frac{5}{9}) = 8 + \frac{2}{9} = 8\frac{2}{9}$$

в) $$2\frac{3}{10} + 7 = 2 + \frac{3}{10} + 7 = 9 + \frac{3}{10} = 9\frac{3}{10}$$

г) $$9\frac{6}{8} - 4 = 9 + \frac{6}{8} - 4 = 5 + \frac{6}{8} = 5\frac{6}{8} = 5\frac{3}{4}$$

Ответ: a) $$4\frac{3}{5}$$; б) $$8\frac{2}{9}$$; в) $$9\frac{3}{10}$$; г) $$5\frac{3}{4}$$