Question

(+1)+(-1)=||
(2)+(-2) = 0
20+1) + (-2) = _
(+3) + 3(-1)=
37+2) + 2-3] =

Answer 1

• 1+(-1)=0
• 2+(-2)=0
• 20+1+(-2)=19
• 3+3(-1)=0
• 37+2+2-3=38