Question

Решить пример по действиям, пожалуйста! ​

Answer 1

Ответ:

0

Пошаговое объяснение:

$1)\ \displaystyle\frac{3}{5} \cdot \displaystyle\frac{5}{{21}} = \displaystyle\frac{1}{7};$

$2)\ - \displaystyle\frac{{15}}{{28}}:\displaystyle\frac{5}{{84}} = - \displaystyle\frac{{15}}{{28}} \cdot \displaystyle\frac{{84}}{5} = - \displaystyle\frac{{5 \cdot 3}}{{14 \cdot 2}} \cdot \displaystyle\frac{{14 \cdot 6}}{5} = - 9;$

$3)\ \displaystyle\frac{1}{7} - ( - 9) = 9\displaystyle\frac{1}{7}$ — числитель первой дроби;

$4)\ 5:\displaystyle\frac{1}{2} = 5 \cdot \displaystyle\frac{2}{1} = 10;$

$5)\ 10 - ( - 10) = 10 + 10 = 20$ — знаменатель первой дроби;

$6)\ 9\displaystyle\frac{1}{7}:20 = \displaystyle\frac{{64}}{7} \cdot \displaystyle\frac{1}{{20}} = \displaystyle\frac{{4 \cdot 16}}{7} \cdot \displaystyle\frac{1}{{4 \cdot 5}} = \displaystyle\frac{{16}}{{35}}$ — первая дробь;

$7)\ 2:\displaystyle\frac{1}{2} = 2 \cdot \displaystyle\frac{2}{1} = 4;$

$8)\ - 3:\displaystyle\frac{1}{3} = - 3 \cdot \displaystyle\frac{3}{1} = - 9;$

$9)\ 4 - ( - 9) = 4 + 9 = 13$ — числитель второй дроби;

$10)\ \displaystyle\frac{1}{2}:2 = \displaystyle\frac{1}{2} \cdot \displaystyle\frac{1}{2} = \displaystyle\frac{1}{4};$

$11)\ - \displaystyle\frac{1}{3}:3 = - \displaystyle\frac{1}{3} \cdot \displaystyle\frac{1}{3} = - \displaystyle\frac{1}{9};$

$12)\ \displaystyle\frac{1}{4} - \left( { - \displaystyle\frac{1}{9}} \right) = \displaystyle\frac{1}{4} + \displaystyle\frac{1}{9} = \displaystyle\frac{{9 + 4}}{{36}} = \displaystyle\frac{{13}}{{36}}$ — знаменатель второй дроби;

$13)\ 13:\displaystyle\frac{{13}}{{36}} = 13 \cdot \displaystyle\frac{{36}}{{13}} = 36$ — вторая дробь;

$14)\ 36 \cdot \displaystyle\frac{1}{{36}} = 1;$

$15)\ \displaystyle\frac{{16}}{{35}} + 1 + \left( { - 1\displaystyle\frac{{16}}{{35}}} \right) = 0.$