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July 2021 1 8 Report

Найдите значение выражения, ПРЕДВАРИТЕЛЬНО СОКРАТИВ ДРОБИ ! .
2) 20/45 + 26/54 4) 14/24 - 39/90 + 15/100 6) 45/72 - 33/144 - 20/64

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lilyatomach

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Пошаговое объяснение:

$2) \frac{20}{45} +\frac{26}{54} =\frac{4}{9} +\frac{13}{27} = \frac{12}{27} +\frac{13}{27} =\frac{25}{27} ;\\\\4) \frac{14}{24} -\frac{39}{90} +\frac{15}{100} = \frac{7}{12} -\frac{13}{30} +\frac{3}{20} =\frac{35}{60} -\frac{26}{60} +\frac{9}{60} = \frac{18}{60} =\frac{3}{10} =0,3;\\\\6)\frac{45}{72} -\frac{33}{144} -\frac{20}{64} = \frac{5}{8} -\frac{11}{48} -\frac{5}{16} =\frac{30}{48} -\frac{11}{48}-\frac{15}{48} = \frac{4}{48} =\frac{1}{12} .$

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