A=25/35x(5/3-47/15) B= (5/9+1/9x5/2)au carré

A= 25/35 x (5/3 - 47/15)
A= 25/35 x (5x5/3x5 - 47/15)
A= 25/35 x (25/15 - 47-15)
A= 25/35 x (-22)/15
A= -550/525
A= 25x(-22) / 25x21
A= -22/21

B= (5/9 + 1/9 x 5/2)²
B= (5/9 + 5/18)²
B= (5x2 / 9x2 + 5/18)²
B= (10/18 + 5/18)²
B= (15/18)²
B= 15x15 / 18x18
B= 225/324
B= 9x25 / 9x36
B= 25/36