Question

Номер 1136 пж очень надо даю 20 б

Answer 1

а,б)

$3 + 8 frac{5}{12} = 11 frac{5}{12} \ 10 frac{6}{7} - 3 = 7 frac{6}{7}$

в, г)

$4 frac{2}{13} + 5 frac{7}{13} = 4 + 5 + frac{2 + 7}{13} = 9 frac{9}{13} \ 8 frac{7}{12} - 4 frac{2}{12} = (8 - 4) + frac{7 - 2}{12} = 4 frac{5}{12}$

д, е)

$4 frac{8}{11} + 5 frac{7}{11} = 4 + 5 + frac{8 + 7}{11} = 9 + frac{15}{11} = 9 + 1 frac{4}{11} = 10 frac{4}{11} \ 7 frac{5}{9} - 2 frac{8}{9} = (7 - 2) + frac{5 - 8}{9} = 5 + ( - frac{3}{9} ) = 4 frac{9}{9} - frac{3}{9} = 4 frac{9 - 3}{9} = 4 frac{6}{9} = 4 frac{2}{3}$

ж, з)

$7 - frac{3}{8} = 6 frac{8}{8} - frac{3}{8} = 6 frac{8 - 3}{8} = 6 frac{5}{8} \ 10 - 3 frac{7}{15} = 9 frac{15}{15} - 3 frac{7}{15} = 6 frac{15 - 7}{15} = 6 frac{8}{15}$