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aselyauaisova @aselyauaisova

March 2022 1 10 Report

Выполните вычитание: 1)1/3-1/9;2)10/21-1/3;3)14/15-3/5;4)17/18-1/9;5)4/9-13/45;6)1/3-7/30.

Answers & Comments

uh19

Verified answer

$\displaystyle\frac{1}{3} -\frac{1}{9} =\frac{1*3}{3*3}-\frac{1}{9}=\frac{3}{9}-\frac{1}{9}=\frac{2}{9}$

$\displaystyle\frac{10}{21}-\frac{1}{3}=\frac{10}{21}-\frac{1*7}{3*7}=\frac{10}{21}-\frac{7}{21}=\frac{3}{21}=\frac{1*3}{7*3}=\frac{1}{7}$

$\displaystyle\frac{14}{15}-\frac{3}{5}=\frac{14}{15}-\frac{3*3}{5*3}=\frac{14}{15}-\frac{9}{15}=\frac{5}{15}=\frac{1*5}{3*5}=\frac{1}{3}$

$\displaystyle\frac{17}{18}-\frac{1}{9}=\frac{17}{18}-\frac{1*2}{9*2}=\frac{17}{18}-\frac{2}{18}=\frac{15}{18}=\frac{5*3}{6*3}=\frac{5}{6}$

$\displaystyle\frac{4}{9}-\frac{13}{45}=\frac{4*5}{9*5}-\frac{13}{45}=\frac{20}{45}-\frac{13}{45}=\frac{7}{45}$

$\displaystyle\frac{1}{3}-\frac{7}{30}=\frac{1*10}{3*10}-\frac{7}{30}=\frac{10}{30}-\frac{7}{30}=\frac{3}{30}=\frac{1*3}{1*10}=\frac{1}{10}$

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