Question

Решите дроби
Даю 20 баллов)))

Answer 1

1)

$\frac{2}{5} + ( - \frac{2}{15} ) = \frac{6}{15} - \frac{2}{15} = \frac{4}{15}$

2)

$- \frac{2}{5} + \frac{3}{4} = - \frac{8}{20} + \frac{15}{20} = \frac{7}{20}$

3)

$- \frac{11}{27} + \frac{5}{18} = - \frac{22}{54} + \frac{15}{54} = - \frac{7}{54}$

4)

$\frac{7}{39} + ( - \frac{9}{26} ) = \frac{14}{78} - \frac{27}{78} = - \frac{13}{78} = - \frac{1}{6}$

5)

$- \frac{1}{4} - \frac{3}{16} = - \frac{4}{16} - \frac{3}{16} = - \frac{7}{16} = 0.4375$

6)

$- \frac{1}{4} - ( - \frac{2}{5} ) = - \frac{5}{20} + \frac{8}{20} = \frac{3}{20} = 0.15$

7)

$- \frac{5}{36} - ( - \frac{5}{27} ) = - \frac{15}{108} + \frac{20}{108} = \frac{5}{108}$

8)

$\frac{1}{28} - \frac{5}{42} = \frac{3}{84} - \frac{10}{84} = - \frac{7}{84} = - \frac{1}{12}$