Question

424. Выполните сложение:
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Answer 1

$1)\frac{2}{45}+\frac{7}{9} = \frac{2}{45}+\frac{7*5}{9*5}=\frac{2}{45}+\frac{35}{45} = \frac{2+35}{45} = \frac{37}{45}\\\\2)\frac{2}{5} + \frac{4}{25} = \frac{2*5}{5*5} + \frac{4}{25} =\frac{10}{25} + \frac{4}{25} =\frac{10+4}{25}=\frac{14}{25} \\\\3)\frac{1}{6}+\frac{7}{18} = \frac{1*3}{6*3}+\frac{7}{18}=\frac{3}{18}+\frac{7}{18} = \frac{3+7}{18} = \frac{10}{18} = \frac{2*5}{2*9} = \frac{5}{9} \\\\4)\frac{19}{42}+\frac{6}{7} = \frac{19}{42}+\frac{6*6}{7*6}=\frac{19}{42}+\frac{36}{42} =$

$= \frac{19+36}{42} =\frac{55}{42} = \frac{42+13}{42}=1\frac{13}{42} \\\\5)\frac{3}{32} + \frac{5}{8} = \frac{3}{32} + \frac{5*4}{8*4} = \frac{3}{32} + \frac{20}{32} =\frac{3+20}{32} = \frac{23}{32} \\\\6)\frac{3}{8} +\frac{1}{56} = \frac{3*7}{8*7} +\frac{1}{56} = \frac{21}{56} +\frac{1}{56} = \frac{21+1}{56} = \frac{22}{56} = \frac{2*11}{2*28}=\frac{11}{28}$