Question

помогите пожалусто с заданием 1670 (1,3)

Answer 1

1) 10х+15
при х=4
40+15=55
2) 14х+28
при х=3
42+28=70

Answer 2

1)3(х+5)+7х
3х+15+7х
10х+15
х=4
10*4+15=55

Answer 3

2)6х+4(2х+7)

Answer 4

6х+8х+28

Answer 5

14х+28

Answer 6

х=3

Answer 7

14*3+28=70