Question

Найди значение выражения : 1)1/9+ 4/9; 2) 7/8-3/8; 3) 15/19-6/19 4) 5/16 +2/16; 5)3/14 +11 /14; 6)11 /21+4/21.

Answer 1

1) $frac{1}{9}+frac{4}{9}=frac{5}{9}$
2) $frac{7}{8}-frac{3}{8}=frac{4}{8}=frac{1}{2}=0,5$
3) $frac{15}{19}-frac{6}{19}=frac{9}{19}$
4) $frac{5}{16}+frac{2}{16}=frac{7}{16}=0,4375$
5) $frac{3}{14}+frac{11}{14}=frac{14}{14}=1$
6) $frac{11}{21}+frac{4}{21}=frac{15}{21}=frac{5}{7}$

Answer 2

$1)frac{1}{9} + frac{4}{9} = frac{1+4}{9} = frac{5}{9} \ \ 2) frac{7}{8}- frac{3}{8} = = frac{7-3}{8} = frac{4}{8} \ \ 3) frac{15}{19} - frac{6}{19} = frac{15-6}{19} = frac{9}{19} \ \ 4) frac{5}{16} + frac{2}{16} = frac{5+2}{16} = frac{7}{16} \ \ 5) frac{3}{14} + frac{11}{14} = frac{3+11}{14} = frac{14}{14}=1 \ \ 6) frac{11}{21} + frac{4}{21} = frac{11+4}{21} = frac{15}{21}$