Question

21 Calcule
al +5+3=
b 1-4-2=-
cl +6+9= 15
d1-4-15=-19
will +31 + / +213
1+7+(+51
1(-31+
+4219
211-71+1-51=
il(-41+1-71
11-51+(-61
kl 1-221+1-19
2
l (+32+1+1413

me ajudem por favor​

Answer 1

a: 8
b: -5
c: 15
d: -19