BŁagam POMOCY!! wszystkim dam NAJ!! zad.10 plisss

a) 1. 31 - 27 = 4 2. 18 - 11 = 7 3. -3 + 3 = 0 4. -7 -(-12) = -7 + 12 = 5 5. -25 + 15 = -10  6. 2 - 5 = -3 b) 1. -15-(-4) = -15 + 4 = -11 2. -1 +(-2) = -1 - 2 = -3 3. 0 +(-8) = 0 - 8 = -8 4. 10 - 17 = -7 5. 16+(-5) = 16 - 5 = 11 6. 35+(-15) = 35 - 15 = 20