ex2/ A/7+6-12-7=13-19= -6
B/ 19-7+1-9= 12-8= 4
C/-1,23+4,7+5-10= 3,47-5= -1.53
D/ 10+2-0.8+0.2= 12-0.6= 11.4
E/ -15+19-12-7+14-20
= 4-19-6= -21
F/ -6.3+24-36.7+19
= 17.7-17.7=0
G/ 4.5-18.1+0.25+9-1.9
= -13.6+9.25-1.9
= - 4.35-1.9= -6.25
H/ 6.7-3.4-15-0.6+3.3
= 3.3-15.6+3.3= -12.3+3.3= -9