Question

7 выполните действия. а) 3/4 - 1/2 + 1/5; b) 5/9 + 7/12 - 2/3; с) 5/8 - 3/10 + 13/20 d) 13/15 + 1/12 - 2/3​

Answer 1

Ответ:

$a) \frac{3}{4} - \frac{1}{2} + \frac{1}{5} = \frac{15 - 10 + 4}{20} = \frac{9}{20}$

$b)\frac{5}{9} + \frac{7}{12} - \frac{2}{3} = \frac{20 + 21 - 24}{36} = \frac{17}{36}$

$c) \frac{5}{8} - \frac{3}{10} + \frac{13}{20} = \frac{25 - 12 + 26}{40} = \frac{39}{40}$

$d) \frac{13}{15} + \frac{1}{12} - \frac{2}{3} = \frac{52 + 5 - 40}{60} = \frac{17}{60}$