Question

*Задание 3. Вычислите*
9- 7ц7/8=
(1/6+5/7)-13/21
Плис помогите дәм 50балов​

Answer 1

Решение:

$9 - 7\dfrac{7}{8} = 8\dfrac{8}{8} = 7\dfrac{7 }{8} = (8 - 7)+ \Big ( \dfrac{8}{8} - \dfrac{7}{8} \Big ) = 1 + \dfrac{1}{8} = 1\dfrac{1}{8}$

$\Big (\dfrac{1}{6}+ \dfrac{5}{7}\Big ) - \dfrac{13}{21} = \dfrac{11}{42}$

$1)~ \dfrac{1}{6}+ \dfrac{5}{7} = \dfrac{7}{42}+ \dfrac{30}{42} =\dfrac{37}{42}$

$2)~ \dfrac{37}{42} - \dfrac{13}{21} = \dfrac{37}{42} - \dfrac{26}{42} = \dfrac{11}{42}$