Задание 3. Найдите корень уравнения.

Решение:

1. 10(x-9)=7

10x - 90 = 7

10x = 97

x = 97/10

2. 10(x+2)=-7

10x + 20 = -7

10x = -27

x = -27/10

3. 5(x-6)=2

5x - 30 = 2

5x = 32

x = 32/5

4. 5(x+2)=-7

5x + 10 = -7

5x = -17

x = -17/5

5. 5(x+9)=-8

5x + 45 = -8

5x = -53

x = -53/5

6. 4(x-2)=-1

4x - 8 = -1

4x = 7

x = 7/4

7. 4(x-8)=-5

4x - 32 = -5

4x = 27

x = 27/4

8. 4(x-6)=5

4x - 24 = 5

4x = 29

x = 29/4

9. 4(x+1)=9

4x + 4 = 9

4x = 5

x = 5/4

10. 4(x+10)=-1

4x + 40 = -1

4x = -41

x = -41/4

Ответ: 1) x = 97/10; 2) x = -27/10; 3) x = 32/5; 4) x = -17/5; 5) x = -53/5; 6) x = 7/4; 7) x = 27/4; 8) x = 29/4; 9) x = 5/4; 10) x = -41/4.