13. Реши уравнения, 18、x=90 720:x=4 350:x=5.10 x:30-60-5 100-4500 2310-4500

Решим уравнения:

1. 18 * x = 90

   x = 90 / 18

   x = 5

2. 720 : x = 4

   x = 720 / 4

   x = 180

3. 350 : x = 5 * 10

   350 : x = 50

   x = 350 / 50

   x = 7

4. x : 30 = 60 - 5

   x : 30 = 55

   x = 55 * 30

   x = 1650

5. x * 100 = 4500

   x = 4500 / 100

   x = 45

6. x : 10 = 4500

   x = 4500 * 10

   x = 45000