Numero 20 et 21 sil vous plait

bonsoir

k = - 8 - 4 + 9 = - 12 + 9 = - 3

l = 7 - 8 = - 1

m = 4 - 10 = - 6

n = - 6 * 4 = - 24

p = 4 + ( - 6) = 4 - 6 = - 2

q = - 20 - 10 = - 30

3/5 + 3/10 = 6/10 + 3/10 = 9/10

b ) 5/6 - 15/8 = 20/24 - 45/24 = - 25/24

c) 12 - 15/8 = 96/8 - 15/8 = 81/8

d) 5/6 * 4/3 - 15/8 = 20/18 - 15/8 = 80/72 - 135/72 = - 55/72