Răspuns:
1)
a = -13 -(-2)
a = -13 + 2
a = -11
b = -4 +(-7)
b = -4 - 7
b = -11
a) a = -11
b) a + b = -11 + -11
a + b = 0
c) a - b = -11 - (-11)
a - b = -11 + 11
a - b = 0
d) a * b = -11 * -11
a * b = 121
