Question

Выполните вычитание А)1/5-7/15. Б)-1/2-(-2/3) В)-5/24-(-11/36)​

Answer 1

Ответ:

$-\frac{4}{15}; \quad \frac{1}{6}; \quad \frac{7}{72};$

Пошаговое объяснение:

$\frac{1}{5}-\frac{7}{15}=\frac{3}{15}-\frac{7}{15}=\frac{3-7}{15}=\frac{-7+3}{15}=\frac{-(7-3)}{15}=\frac{-4}{15}=-\frac{4}{15};$

$-\frac{1}{2}-(-\frac{2}{3})=-\frac{1}{2}+\frac{2}{3}=-\frac{3}{6}+\frac{4}{6}=\frac{-3+4}{6}=\frac{4-3}{6}=\frac{1}{6};$

$-\frac{5}{24}-(-\frac{11}{36})=-\frac{5}{24}+\frac{11}{36}=-\frac{15}{72}+\frac{22}{72}=\frac{-15+22}{72}=\frac{22-15}{72}=\frac{7}{72};$

Answer 2

А) 3/15-7/15= -4/15
Б) -1/2-(-2/3)=-1/2+2/3=-3/6+4/6=1/6
В) -5/24-(-11/36)= -5/24+11/36=-15/72+22/72=7/72