Question

Решите, плиззз
Даю 50 баллов​

Answer 1

228. а)

$- 49 + 67 + ( - 37) = 18 - 37 = - 19$

б)

$- 1.4 + 0.6 + \frac{7}{15} = - 0.8 + \frac{7}{15} = - \frac{8}{10} + \frac{7}{15} = - \frac{24}{30} + \frac{14}{30} = - \frac{10}{30} = - \frac{1}{3}$

229. а)

$- 543 + 458 = - 85$

б)

$0.54 + ( - 0.83) = - 0.29$

в)

$- 2 \frac{5}{7} + 3 = 2 \frac{7}{7} - 2 \frac{5}{7} = \frac{2}{7}$

г)

$- \frac{2}{9} + ( - \frac{5}{6} ) = - \frac{12}{54} - \frac{45}{54} = - \frac{57}{54} = - 1 \frac{3}{54} = - \frac{1}{18}$

д)

$2 \frac{9}{11 } + ( - 3 \frac{7}{22} ) = \frac{31}{11} - \frac{73}{22} = \frac{62}{22} - \frac{73}{22} = - \frac{11}{22} = - 0.5$

230.

$x = - 1.47 \\ \\ - 1.47 + 2.6 = 1.13$

$x = - 3 \frac{1}{6} \\ \\ - 3 \frac{1}{6} + 2.6 = - \frac{19}{6} + \frac{26}{10} = - \frac{190}{60} + \frac{156}{60} = - \frac{4}{60} = - \frac{1}{15}$

$x = - 18 \\ \\ - 18 + 2.6 = - 15.4$

$x = - 2 \frac{13}{50} \\ \\ - 2 \frac{13}{50} + 2.6 = - \frac{113}{50} + \frac{26}{10} = - \frac{113}{50} + \frac{130}{50} = \frac{17}{50}$