ГДЗ Математика 5 класс Никольский. Задание 834

ОТВЕТЫ К ЗАДАНИЯМ

Вычислите:
а)

\frac{3}{36} + \frac{7}{9}

;

б)

\frac{2}{5} + \frac{3}{20}

;

в)

\frac{1}{6} + \frac{5}{12}

;

г)

\frac{11}{49} + \frac{6}{7}

;

д)

\frac{13}{24} + \frac{5}{8}

;

е)

\frac{3}{8} + \frac{6}{32}

;

ж)

\frac{6}{120} + \frac{3}{20}

;

з)

\frac{9}{16} + \frac{50}{100}

\frac{3}{36} + \frac{7}{9} = \frac{3}{36} + \frac{7 * 4}{9 * 4} = \frac{3 + 28}{36} = \frac{31}{36}

\frac{2}{5} + \frac{3}{20} = \frac{2 * 4}{5 * 4} + \frac{3}{20} = \frac{8 + 3}{20} = \frac{11}{20}

\frac{1}{6} + \frac{5}{12} = \frac{1 * 2}{6 * 2} + \frac{5}{12} = \frac{2 + 5}{12} = \frac{7}{12}

\frac{11}{49} + \frac{6}{7} = \frac{11}{49} + \frac{6 * 7}{7 * 7} = \frac{11 + 42}{49} = \frac{53}{49}

\frac{13}{24} + \frac{5}{8} = \frac{13}{24} + \frac{5 * 3}{8 * 3} = \frac{13 + 15}{24} = \frac{28}{24}

\frac{3}{8} + \frac{6}{32} = \frac{3 * 4}{8 * 4} + \frac{6}{32} = \frac{12 + 6}{32} = \frac{18}{32}

\frac{6}{120} + \frac{3}{20} = \frac{6}{120} + \frac{3 * 6}{20 * 6} = \frac{6 + 18}{120} = \frac{24}{120} = \frac{1 * 24}{5 * 24} = \frac{1}{5}

\frac{9}{16} + \frac{50}{100} = \frac{9}{16} + \frac{1 * 50}{2 * 50} = \frac{9}{16} + \frac{1}{2} = \frac{9}{16} + \frac{1 * 8}{2 * 8} = \frac{9 + 8}{16} = \frac{17}{16}