Question

Так 1 задание по математике потом отправлю 2​

Answer 1

Ответ:

Пошаговое объяснение:

7/15 = x/45

15*x = 45*7

15x = 315

x = 315 : 15

x = 21

--------------------

9/x = 3/7

3*x = 9*7

3x = 63

x = 63 : 3

x = 21

--------------------

x : 2 3/23 = 3 1/7 : 1/4

1/4 * x = 3 1/7 * 2 3/23

1/4 * x = 22/7 * 49/23

1/4 * x = 154/23

x = 154/23 * 4/1

x = 616/23

x = 26 18/23

===================

№2

2 4/7 * 1 5/9 = 18/7 * 14/9 = 4

1 7/9 * 2 1/4 = 16/9 * 9/4 = 4

4 = 4 ;

равенство верно

Answer 2

$\displaystyle 1)\frac{7}{15}=\frac{x}{45}\\\\ 315=15x\\15x=315\\x=21\\\\ 2)\frac{9}{x}=\frac{3}{7},x\neq 0\\\\ 63=3x\\3x=63\\x=21\\\\ 3)x:2\frac{3}{23}=3\frac{1}{7}:\frac{1}{4}\\\\ x=4*3\frac{1}{7}*2\frac{3}{23}\\\\ x=4*\frac{22}{7}*\frac{49}{23}\\\\ x=4*22*\frac{7}{23}\\\\ x=\frac{616}{23}=26\frac{18}{23}$