Question

и) -4/5 + (-5/6) =
к) - 3 1/7 + (-1 3/14) =
л)-1 2/5 + (-2,8) =
м) -1 1/3 + (-2,25) =


помогите пожалуйста.
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Answer 1

и)

$- \frac{4}{5} + ( - \frac{5}{6} ) = - \frac{4}{5} - \frac{5}{6} = - \frac{24 + 25}{30} = - \frac{49}{30} = - 1 \frac{19}{30}$

к)

$- 3 \frac{1}{7} + ( - 1 \frac{3}{14}) = - 3 \frac{1}{7} - 1 \frac{3}{14} = - (3 \frac{1}{7} + 1 \frac{3}{14} ) = - ((3 + 1) + ( \frac{1}{7} + \frac{3}{14} )) = - 4 \frac{5}{14}$

л)

$- 1 \frac{2}{5} + ( - 2.8) = - \frac{7}{5} - \frac{14}{5} \\ = - \frac{21}{5} = - 4 \frac{1}{5}$

м)

$- 1 \frac{1}{3} + ( - 2.25) = - \frac{4}{3 } - \frac{9}{4} = - \frac{43}{12} = - 3 \frac{7}{12}$