1) 22,6 + (6,8 – 30,1) – (6,8 + 1,9) = 22,6 + (-23,3) - 8,7 = -9,4.
2)а) 1,2y + 3,6y - 0,7y = 4,1y - 0,7y = 3,4y;б) 6b - b = 5b;в) 7x - 6y - 2x + 8y = 7x - 2x - 6y + 8y = 5x + 2y;г) -4m + m + 3 = -3m + 3;д) x + 2(3x - 1) = x + 6x - 2 = 7x - 2.
3) 6(x + 2) = 5(x - 3)6x + 12 = 5x - 156x - 5x = -15 - 12x = -27.
1) 22,6 + (6,8 – 30,1) – (6,8 + 1,9) = 22,6 + (-23,3) - 8,7 = -9,4.
2)
а) 1,2y + 3,6y - 0,7y = 4,1y - 0,7y = 3,4y;
б) 6b - b = 5b;
в) 7x - 6y - 2x + 8y = 7x - 2x - 6y + 8y = 5x + 2y;
г) -4m + m + 3 = -3m + 3;
д) x + 2(3x - 1) = x + 6x - 2 = 7x - 2.
3) 6(x + 2) = 5(x - 3)
6x + 12 = 5x - 15
6x - 5x = -15 - 12
x = -27.