Bonjour! Je vais essayer a t'aider! :)
c = 1/5-3/5*1/6+2
c = 1/5-3/30 + 2
c = 1*6/5*6 - 3/30 + 2
c = 6/30 - 3/30 + 2
c = 3/30 + 60/30
c = 63/30
c = 21 * 3/10 * 3
c = 21/10
d = (1/2-3/4)*4/6
d = (1*2/2*2 - 3/4)*4/6
d = (2/4 - 3/4)*4/6
d = -1/4*4/6
d = -4/24
d = -1 * 4/6*4
d = -1/6
J'espere avoir aide! :)