Question

КТО ВЫПОЛНИТ ДАМ 40 БАЛОВ

Answer 1

Пошаговое объяснение:

$1. \: \: 1) - 2 + 7 = 5$

$2)3 + ( - 8) = - 5$

$3) - \frac{2}{9} + \frac{5}{6} = - \frac{4}{18} + \frac{15}{18} = \frac{11}{18}$

$4) - 3.9 - 8.4 = - 12.3$

$5)4.5 - 8.3 = - 3.8$

$6) - 1 \frac{3}{4} - 2 \frac{1}{12} = - 1 \frac{9}{12} - 2 \frac{1}{12} = - 3 \frac{5}{6}$

$2. \: \: 1)6 + ( - 7) - ( - 15) - ( - 6) - 30 = - 1 - ( - 15) - ( - 6) - 30 = 14 - ( - 6) - 30 = 20 - 30 = - 10$

$2)3 \frac{1}{6} + ( - 2 \frac{5}{9} ) - ( - 1 \frac{7}{12} ) = 3 \frac{3}{18} + ( - 2 \frac{10}{18} ) - ( - 1 \frac{7}{12} ) = \frac{11}{18} - ( - 1 \frac{7}{12} ) = \frac{22}{36} - ( - 1 \frac{21}{36} ) = 2 \frac{7}{36}$

$3. \: \: 1)28 + x = 15 \\ x = 15 - 28 \\ x = - 13$

$2)30 - x = - 17 \\ x = 30 - ( - 17) \\ x = 47$

$3)x + 3.12 = - 5.43 \\ x = - 5.43 - 3.12 \\ x = - 8.55$

$4)y - 3 \frac{5}{12} = - 2 \frac{7}{15} \\ y = - 2 \frac{7}{15} + 3 \frac{5}{12} \\ y = - 2 \frac{28}{60} + 3 \frac{25}{60} \\ y = \frac{19}{20} \\ y = \frac{95}{100} \\ y = 0.95$