Bonjour !
Calculer:
A=5/4+ 1/1 x 5/33= 5/4 + 1/1 x 5/3= 5/4+ (1x5)/(1x3)= 5/4+5/3= (5x3+5x4)/(4x3)
= 35/12
B= [ (1x6-5)/6 ] / [ (1x4-7)/4 ]= (1/6) / (-3/4)= (1/6)x(-4/3)= (-1x4)/(6x3)= -4/18= -2/9
C= (1/12) / [ (2x4 - 3)/ 4 ]= (1/12)/(5/4)= (1/1)x(4/5)= (1/3)x(1/5)= (1x1)/(3x5)= 1/15.
D= [ (2x3+2)/3 ] / [ (4x3-2x5)/(5x3) ]= (8/3) / (2/15)= (8/3)x(15/2)= (4)x(5)= 20
*** des simplifications avant pendant et après le résultat .
