Question

Вычислите:а) 3/8+5/8; б) 7/15-2/15;в) 1/7+3/7+2/7;г) 3/11+8/11-4/11. (Дроби)

Answer 1

$1) frac{3}{8}+ frac{5}{8}= frac{3+5}{8}= frac{8}{8}=1 \ \ 2) frac{7}{15}- frac{2}{15}= frac{7-2}{15}= frac{5}{5*3}= frac{1}{3} \ \ 3) frac{1}{7} +frac{3}{7}+ frac{2}{7}= frac{1+3+2}{7}= frac{6}{7} \ \ 4) frac{3}{11} + frac{8}{11}- frac{4}{11}= frac{3+8-4}{11}= frac{7}{11}$