Question

помогите решить и расписать
а) -117+(-204)
б) -8 1113+5 23
с) - 29,78+(-31,52)
d) - 2. 25-(3 3/8-2 14

Answer 1

$a) : - 117 + ( - 204) = - 321$
$b) : - 8 frac{11}{13} + 5 frac{2}{3} = - frac{115}{13} + frac{17}{3} = frac{ - 345 + 221}{39} = - frac{ 124}{39}$
$c) : - 29,78 + ( - 31,52) = - 29,78 - 31,52 = - 61,3$
$d) : - 2 frac{2}{5} - (3 frac{3}{8} - 2 frac{1}{4} ) = frac{51}{40} \ 1) : 3 frac{3}{8} - 2 frac{1}{4} = frac{27}{8} - frac{9}{4} = frac{27 - 18}{8} = frac{9}{8} \ 2) : 2 frac{2}{5} - frac{9}{8} = frac{12}{5} - frac{9}{8} = frac{96 - 45}{40} = frac{51}{40}$