<span>а) 0,12+(-0,05)+3,4-(-6)=0,12-0,05+3,4+6=9,47</span>
<span><span> -1,018-4,29-(-0,5)+(-4)=-1,018-4,29+0,5-4=-8,808</span></span>
<span><span><span> 0,546+(-1,2)-(-12,8)-7,09=0,546-1,2+12,8-7,09=5,056</span></span></span>
<span><span><span><span> 6,208-2,73-(-3,792)-4,65=6,208-2,73+3,792-4,65=2,62</span></span></span></span>