1) 34,4 - (18,1 - 5,6) + (-11,9 +8) = 34,4 -18,1 +5,6 -11,9 +8 = 18
2) а) 4m - 6m - 3m +7 + m = 7 - 4m
б) -8( x-3) + 4(x - 2) - 2 (3x + 1) = -8x + 24 + 4x - 8 - 6x- 2 = 14 - 10x
в) 2/7 (14а - 3и1/2b) - 1.2( 5/6a - 0.5b) = 2/7(14a - 7/2b) - 6/5( 5/6a - 1/2b) =
= 4a - b - a +3/5 b = 3a -2/5b
3) 0.6( x-3) - 0.5(x - 1) = 1.5
0.6x - 1.8 - 0.5x +0.5 = 1.5
0.1x = 2.8
x = 28