Question

Составить и решить 10 уравнений с рациональными числами на сложение и вычитание.

Answer 1

1)
$7 frac{2}{3} + 1 = 8 frac{2}{3}$
2)
$frac{8}{15} + 0 = frac{8}{15}$
3)
$( - frac{6}{8} ) + frac{6}{8} = 0$
4)
$frac{7}{10} + frac{7}{8} = frac{28}{40} + frac{35}{40} = frac{63}{40} = 1 frac{23}{40}$
5)
$7 frac{2}{10} - 2 frac{5}{10} = 4 frac{7}{10}$
6)
$- frac{1}{4} + frac{3}{4} = frac{3}{4} - frac{1}{4} = frac{2}{4} = frac{1}{2}$
7)
$7 frac{5}{6} + 6 frac{7}{15} = 13 + ( frac{5}{6} + frac{7}{15} ) = 13 + ( frac{25}{30} + frac{14}{30} ) = 13 + frac{39}{30} = 13 + 1 frac{9}{30} = 14 frac{9}{30} = 14 frac{3}{10}$
8)
$- frac{1}{3} + 1 = 1 - frac{1}{3} = frac{3}{3} - frac{1}{3} = frac{2}{3}$
9)
$frac{2}{3} + frac{3}{5} = frac{10}{15} + frac{9}{15} = frac{10 + 9}{15} = frac{19}{15} = 1 frac{4}{15}$
$frac{3}{8} + frac{1}{6} + frac{7}{8} - frac{1}{3} = frac{9}{24} + frac{4}{24} + frac{21}{24} - frac{8}{24} = frac{9 + 4 + 21 - 8}{24} = frac{26}{24} = 1 frac{2}{24} = 1 frac{1}{12}$
10)
$- 4 frac{1}{5} - ( - 1 frac{1}{2} ) = - 4 frac{1}{5} + 1 frac{1}{2} = 1 frac{1}{2} - 4 frac{1}{5} = frac{3}{2} - frac{21}{5} = frac{15}{10} - frac{42}{10} = - frac{27}{10} = - 2 frac{7}{10}$