bonjour
A = ( 1/4 - 3 /2 ) : ( - 3/5 - 1 /2 )
A = ( 1/4 - 6/4 ) : ( - 6/10 - 5/10 )
A = - 5 /4 : - 11 /10
A = - 5/4 x - 10/11
A = 50/44 = 25/22
B = ( - 9 - 10) /12 x - 4/5
B = - 19/12 x - 4/5
B = - 76/60 = - 19/15
C = 9/4 - 1 /3 x - 5/2
C = 9/4 + 5/6
C = 27/12 + 10/12 = 37/12
fais le dernier comme le A
