Respuesta :
Answer:
9-8=1
7-(-6)=13
Step-by-step explanation:
you just add it the normal way.
Answer:
See below
Step-by-step explanation:
See following examples
a and b
- a- b
a and -b
- a - (-b) = a + b
-a and b
- -a - b = -(a + b)
-a and - b
- -a - (-b) = -a + b = b - a