Условие:

Реши уравнения.
18 * x = 90;
720 : x = 4;
350 : x = 5 * 10;
x : 30 = 60 * 5;
x * 100 = 4500;
x : 10 = 4500.

18 * x = 90
x = 90 : 18
x = 5
 
720 : x = 4
x = 720 : 4
x = 180
 
350 : x = 5 * 10
350 : x = 50
x = 350 : 50
x = 7
 
x : 30 = 60 * 5
x : 30 = 300
x = 300 * 30
x = 9000
 
x * 100 = 4500
x = 4500 : 100
x = 45
 
x : 10 = 4500
x = 4500 * 10
x = 45000