а-б:
8-(-13) = 8+13 = 21
0-(-7) = 7
-4-(-16) = -4+16 = 16-4 = 12
-15-4 = -19
1-15 = -14
-18-0 = -18
б-а:
-13-8=-21
-7-0 = -7
-16-(-4) = -16+4 = -12
4-(-15) = 4+15 = 19
15-1 = 14
0-(-18) = 0+18 = 18
а-б:
8-(-13) = 8+13 = 21
0-(-7) = 7
-4-(-16) = -4+16 = 16-4 = 12
-15-4 = -19
1-15 = -14
-18-0 = -18
б-а:
-13-8=-21
-7-0 = -7
-16-(-4) = -16+4 = -12
4-(-15) = 4+15 = 19
15-1 = 14
0-(-18) = 0+18 = 18