1)34,4-(18,1-(-5,6))+(-11,9+8)
34,4-(18,1+5,6)+(3,9)
34,4-23,7-3,9=6,8
2)а)4m-6m-3m+7+m= -4m+7
b)-8(x-3)+4(x-2)-2(3x+1)
-2(4(x-3)-2(x-2)+3x+1)
-2(4x-12-2x+4+3x+1)= -2(5x-7)
3)0.6(x-3)-0.5(x-1)=1.5
0.6x-1.8-0.5x+0.5=1.5
0.1x-1.3=1.5
0.1x=1.5+1.3
0.1x=2.8
x=2.8:0.1
x=28