Question

1. Вычислите:

1)1718-718+518; 2)3 419-1 219+5 1019

2. Выполните действия:

а) 45 : 7; б)1351  3.

Answer 1

1)$frac{17}{18} - frac{7}{18} + frac{5}{18} = frac{10+5}{18} = frac{15}{18} = frac{5}{6}$

2)$3 frac{4}{19} -1 frac{2}{19}+5 frac{10}{19} = frac{61}{19} - frac{21}{19} + frac{105}{19} = frac{40}{19} + frac{105}{19} = frac{145}{19} =7 frac{12}{19}$

а)$frac{4}{5} :7= frac{4}{5} * frac{1}{7} = frac{4}{35}$

б)$frac{13}{51} : 3= frac{13}{51} * frac{1}{3} = frac{13}{153}$

б2)$frac{13}{51} * 3= frac{39}{51} = frac{13}{17}$