Завдання:
Розв’яжи рівняння:
1) 8 ⋅ 13x = 312;
2) (4x ⋅ 3) : 5 = 72;
3) 42 – x ⋅ 5 = 12;
4) x : 5 – 23 = 42.
Розв'язок:
1) 8 ⋅ 13x = 312
104x = 312
x = 312 : 104
x = 3
2) (4x ⋅ 3) : 5 = 72
12x = 72 • 5
12x = 360
x = 360 : 12
x = 30
3) 42 – x ⋅ 5 = 12
5x = 42 - 12
5x = 30
x = 30 : 5
x = 6
4) x : 5 – 23 = 42
x : 5 = 42 + 23
x : 5 = 65
x = 65 • 5
x = 325