Ответ:
1) 34,4-18,1+5,6-11,9+8=18
2) а) 4m-15-6m+20 = -2m+5
б) 6+4a-10+7a = -4+11
в) 8b-(2b+5) = 6b-5
г) 6a-(4a-8) = 2a+8
д) 8(k-3)+4(k-2) = 8k-5+4k-8 = 12k-13
е) 3(2c+3)-5(c-2) = 6c+9-5c+10 = 16c+4
ж) 0.6(x-3)-2.7(x-1) = 0.6x-1.8-2.7x+2.7 = -2.1x+0.9
з) -8(2-2y)+4(3-4y) = -16+16y+12-16y = -4