AIDER MOI SVP JE COMPREND PAS !

a) 3/5 *4/9 = 3*4/5*9 = 12/45 et pour simplifier 4*3/3*15 = 4/15
b) 15/20*3/5 = 15*3/20*5 = 45/100 = 9*5/20*5 = 9/20
c)12/18 * 3/4 = 12*3/ 18*4 = 36/ 72 = 36*1/36*2 = 1/2
d)5/13*26/35= 5*26/13*35= 130/455= 5*13*2/13*7*5=2/7
e) 19/49*7= 19*7/49 = 19*7/7*7= 19/7
f) 6/7 * 2/5 * 14/10 = 6*2 *14 /7*5*10 = 6*2*7*2/7*5*5*2=12/25