Решите уравнения и сделайте проверку номер: 469 (в номере сделать номер 2 и 3)

Пошаговое объяснение:

1) 7(x+6)=49

x+6=49:7

x+6=7

x=7-6

x=1

проверка

7(x+6) = 7*(1+6)=7*7=49 - верно

15(x-10) = 255

x-10 = 255:15

x-10 = 17

x = 17+10

x = 27

проверка

15*(x-10) = 15*(27-10) = 15*17 = 255 - верно

27(19-x) = 324

19-x = 324:27

19-x = 12

x = 19-12

x = 7

проверка

27*(19-x) = 27*(19-7) = 27*12 = 324 - верно

2) 3(2x-9) = 27

2x-9 = 27:3

2x-9 = 9

2x = 9+9

2x=18

x = 18:2

x = 9

проверка

3*(2x-9) = 3*(2*9 - 9) = 3*(18-9) = 3*9 = 27 - верно

9(5x+8) = 207

5x+8 = 207:9

5x+8 = 23

5x = 23-8

5x = 15

x = 15:5

x = 3

проверка

9*(5x+8) = 9*(5*3+8) = 9*(15+8) = 9*23 = 207 - верно

19(39-2x) = 703

39-2x = 703:19

39-2x = 37

2x = 39-37

2x = 2

x = 2:2

x = 1

проверка

19*(39-2x) = 19*(39-2*1) = 19*(39-2) = 19*37 = 703 - верно