1,5(0,4x + x) + 0,4x + x = 701,5(1,4x) + 0,4x + x = 702,1x + 0,4x + x = 703,5x = 70x = 70 / 3,5x = 20
Ответ: x = 20.
1,5(0,4x + x) + 0,4x + x = 70
1,5(1,4x) + 0,4x + x = 70
2,1x + 0,4x + x = 70
3,5x = 70
x = 70 / 3,5
x = 20
Ответ: x = 20.