Упр.71 Часть 2 ГДЗ Виленкин Жохов 6 класс (Математика)

Задача

а) 1 — 4/7
*2
:3/7
-1 1/3
_
?
6) 2 — 5/9
:13
*9
-23
_
?
в) 16/17 : 8
*17
-1 7/8
:2
_
?
г) 1/4 * 2/3
+1/3
:4
*4/5
_
?
д) 2/5 + 4/15
-1/3
:5/6
*5
_
?

Подробный ответ

а)

$$ 1-\frac{4}{7}=\frac{3}{7} $$
$$ \frac{3}{7}\cdot 2=\frac{6}{7} $$
$$ \frac{6}{7}:\frac{3}{7}=2 $$
$$ 2-1\frac{1}{3}=\frac{2}{3} $$

б)

$$ 2-\frac{5}{9}=1\frac{4}{9} $$
$$ 1\frac{4}{9}:13=\frac{13}{9}\cdot\frac{1}{13}=\frac{1}{9} $$
$$ \frac{1}{9}\cdot 9=1 $$
$$ 1-23=-22 $$

в)

$$ \frac{16}{17}:8=\frac{16}{17}\cdot\frac{1}{8}=\frac{2}{17} $$
$$ \frac{2}{17}\cdot 17=2 $$
$$ 2-1\frac{7}{8}=\frac{1}{8} $$
$$ \frac{1}{8}:2=\frac{1}{8}\cdot\frac{1}{2}=\frac{1}{16} $$

г)

$$ \frac{1}{4}\cdot\frac{2}{3}=\frac{1}{6} $$
$$ \frac{1}{6}+\frac{1}{3}=\frac{1}{6}+\frac{2}{6}=\frac{3}{6}=\frac{1}{2} $$
$$ \frac{1}{2}:4=\frac{1}{2}\cdot\frac{1}{4}=\frac{1}{8} $$
$$ \frac{1}{8}\cdot\frac{4}{5}=\frac{1}{10} $$

д)

$$ \frac{2}{5}+\frac{4}{15}=\frac{6}{15}+\frac{4}{15}=\frac{10}{15}=\frac{2}{3} $$
$$ \frac{2}{3}-\frac{1}{3}=\frac{1}{3} $$
$$ \frac{1}{3}\cdot\frac{5}{6}=\frac{5}{18} $$
$$ \frac{5}{18}\cdot 5=\frac{25}{18} $$