Resposta :
a) 8+[(3-1)+2] = 8 +2+2 = 12
b) 9-[(8+4)-10] = 9 - 12+10= 7
c) 12-[8-(5+2)]-1 = 12-8+7-1= 10
d) [8-(2+2)]= 8 - 4 = 4
e) 5+[9-(2-1)]= 5 + 9-1= 13
f) 20+[5+(3-1)] = 20+5+2= 27
g) 10+[8-(6-1)]= 10+8-5=13
h)14-[6+(2-1)]= 14-6-1= 7
i)19+[10-(4+3)]= 19+10-7= 22
b) 9-[(8+4)-10] = 9 - 12+10= 7
c) 12-[8-(5+2)]-1 = 12-8+7-1= 10
d) [8-(2+2)]= 8 - 4 = 4
e) 5+[9-(2-1)]= 5 + 9-1= 13
f) 20+[5+(3-1)] = 20+5+2= 27
g) 10+[8-(6-1)]= 10+8-5=13
h)14-[6+(2-1)]= 14-6-1= 7
i)19+[10-(4+3)]= 19+10-7= 22