(x-2(x-(2x-1))) = x - 2(x - 2x + 1) = x - 2(-x + 1) = x + 2x - 2 = 3x - 2При x = 2,5: 3*2,5 - 2 = 7,5
2(x+2y) - 4(y-x) = 2x + 4y - 4y + 4x = 6xПри x = 2,5: 6*2,5 = 15
(x-2(x-(2x-1))) = x - 2(x - 2x + 1) = x - 2(-x + 1) = x + 2x - 2 = 3x - 2
При x = 2,5: 3*2,5 - 2 = 7,5
2(x+2y) - 4(y-x) = 2x + 4y - 4y + 4x = 6x
При x = 2,5: 6*2,5 = 15