Ответы
Пошаговое объяснение:
№1
х : 4 = 25 : 5
х * 5 = 4 * 25
5х = 100
х = 100 : 5
х = 20
70 : х = 20 : 2
х * 20 = 70 * 2
20х = 140
х = 140 : 20
х = 7
30/х = 36/6
х * 36 = 30 * 6
36х = 180
х = 180 : 36
х = 5
х/5 = 16/4
х * 4 = 5 * 16
4х = 80
х = 80 : 4
х = 20
140/х = 40/2
х * 40 = 140 * 2
40х = 280
х = 280 : 40
х = 7
№2
б)
48 : х = 30 : 25
х * 30 = 48 * 25
х = (48 * 25)/30
х = (8 * 25)/5
х = 200/5
х = 40
в)
17 : 3 = х : 9
3 * х = 17 * 9
х = (17 * 9)/3
х = (17 * 3)/1
х = 51/1
х = 51
г)
х : 21 = 4 : 6
х * 6 = 21 * 4
х = (21 * 4)/6
х = (7 * 4)/2
х = 28/2
х = 14
д)
13 : х = 39 : 6
х * 39 = 13 * 6
х = (13 * 6)/39
х = (1 * 6)/3
х = 6/3
х = 2
е)
34 : 6 = 51 : х
34 * х = 6 * 51
х = (6 * 51)/34
х = (6 * 3)/2
х = 18/2
х = 9
![](https://st.uroker.com/files/615/6159e31406c76a375a9b4b87cb79d8e9.jpg)
Відповідь:
48 : x = 30 : 25
x • 30 = 48 • 25
x = 48 • 25 : 30
x = 40
17 : 3 = x : 9
x • 3 = 17 • 9
x = 17 • 9 : 3
x = 51
x : 21 = 4 : 6
x • 6 = 21 • 4
x = 21 • 4 : 6
x = 14
13 : x = 39 : 6
x • 39 = 13 • 6
x = 13 • 6 : 39
x = 2
34 : 6 = 51 : x
x • 34 = 6 • 51
x = 6 • 51 : 34
x = 9