1 километров и 545 метров
1) x = 15
2) x = 7
3) x = 1
4) x = 25
5) x = 9
6) x = 26
7) x = 2
8) x = 1
Объяснение:
1) (23 - х) + 5 = 13
23 - x + 5 = 13
28 - x = 13
- x = 13 - 28
- x = - 15
x = 15
2) (х + 4) + 12 = 23
x + 4 + 12 = 23
x + 16 = 23
x = 23 - 16
x = 7
3) 46 + (3 - x) = 48
46 + 3 - x = 48
49 - x = 48
- x = 48 - 49
- x = - 1
x = 1
4) 20(х - 15) = 200
x - 15 = 10
x = 10 + 15
x = 25
5) 24 - (х + 2) = 13
24 - x - 2 = 13
22 - x = 13
- x = 13 - 22
- x = -9
x = 9
6) 43 - (х - 4) = 21
43 - x + 4 = 21
47 - x = 21
- x = 21 - 47
- x = - 26
x = 26
7) 21 - (5 - х) = 18
21 - 5 + x = 18
16 + x = 18
x = 18 - 16
x = 2
8) 10(х + 14) = 130
x + 14 = 13
x = 13 - 14
x = -1
1километр 545 метров :)