Question

Выполните действия: а)8/25 + 7/25 + 9/25 б)13/15 - (8/15 + 4/15) в) (17/100 + 27/100) - (8/100 + 3/100) г) (19/23 - 8/23) + (16/23 - 11/23

Answer 1

$\displaystyle \frac{8}{25}+\frac{7}{25}+\frac{9}{25}=\frac{8+7+9}{25}=\frac{24}{25}\\ \\ \\ \frac{13}{15}-(\frac{8}{15}+\frac{4}{15})=\frac{13}{15}-\frac{8+4}{15}=\frac{13}{15}-\frac{12}{15}=\frac{13-12}{15}=\frac{1}{15}\\ \\ \\ (\frac{17}{100}+\frac{27}{100})-(\frac{8}{100}+\frac{3}{100})=\frac{17+27}{100}-\frac{8+3}{100}=\frac{44}{100}-\frac{11}{100}=\frac{44-11}{100}=\frac{33}{100}\\ \\ \\ (\frac{19}{23}-\frac{8}{23})+(\frac{16}{23}-\frac{11}{23})=\frac{19-8}{23}+\frac{16-11}{23}=$

$\displaystyle =\frac{11}{23}+\frac{5}{23}=\frac{11+5}{23}=\frac{16}{23}$