ayuda a aaaaaaaaaaa porfavor sino saben no contesten urge porfa

-15+8= -7
10+3= 13
-7-2= -9
-12-13= -25
6-5= 1
8-9= 1
17-20= 3
-1-1= -2
-13+14= 1
-2+2= 0
-6.5= 0
3.(-2)= -6
10.(-5)= -50
4.8= 0
20.(-1) -=20
-18/9 =-2
14/2=7
-1/(-1)= 1
-32/(-4)= 8
-25/5= -5