Question

calcule:a)(+12)+(+21) b)(+13)+(-7) c)(-23)+(+21)d)(+3)+(-2)+(-5) e)(-23)+(-4) f)(+5)-(-3)-(-1)

Answer 1

a)(+12)+(+21)
12+21
33
b)(+13)+(-7)
13-7
6
c)(-23)+(+21)
-23+21
-2
d)(+3)+(-2)+(-5)
3-2-5
3-7
-4
e)(-23)+(-4)
-23-4
-27
f)(+5)-(-3)-(-1)
5+3+1
8+1
9