Question

Решите весь 307 номер

Answer 1

А)14+15=920 Б)13+17=1035=27 И т.д

Answer 2

$1) frac{1}{4} + frac{1}{5} = frac{5}{20} + frac{4}{20} = frac{9}{20} \ \ 2) frac{1}{3} + frac{1}{7} = frac{7}{21} + frac{3}{21} = frac{10}{21} \ \ 3) frac{3}{5} + frac{3}{4} = frac{12}{20} + frac{15}{20} = frac{27}{20} =1 frac{7}{20} \ \ 4) frac{1}{2} + frac{7}{9} = frac{9}{18} + frac{14}{18} = frac{23}{18} =1 frac{5}{18} \ \ 5) frac{5}{7} +0= frac{5}{7} \ \ 6) frac{2}{3} - frac{2}{5} = frac{10}{15} - frac{6}{15} = frac{9}{15} = frac{3}{5}$

$7) frac{1}{2} - frac{1}{3} = frac{3}{6} - frac{2}{6} = frac{1}{6} \ \ 8) frac{3}{5} - frac{4}{7} = frac{21}{35} - frac{20}{37} = frac{1}{37} \ \ 9) frac{5}{7} - frac{1}{6} = frac{30}{42} - frac{7}{42} = frac{23}{42} \ \ 10) frac{8}{9} -0= frac{8}{9} \ \ 11) frac{3}{4} + frac{4}{5} = frac{15}{20} + frac{16}{20} = frac{31}{20} =1 frac{11}{20} \ \ 12) frac{3}{4 }+ frac{2}{9} = frac{27}{36} + frac{8}{36} = frac{35}{36}$