HELLO.A=-1x1/-2x-1/2 B=--2/3X(-2/3)x-2/-3 C=1/2x(-2/3) D=-2/6x21/5 C=-4/5x(-7/2) E=(-5/7)² merci a vous

A = - 1 x 1/- 2 x - 1/2
A = - 1 x - 1/2  x - 1/2
A = 1/2 * - 1/2
A = - 1/4

B = - 2/3 x (- 2/3) x - 2/3
B = 4/9 x - 2/3
B = - 8/27

C = 1/2 x (- 2/3)
C = - 2/6
C = 2 x - 1 / 2 x 3
C = - 1/3

D = - 2/6 x 21/5
D = - 42/30
D = 6 x - 7 / 6 x 5
D = - 7/5

C = - 4/5 x (- 7/2)
C = 28/10
C = 2 x 14 / 2 x 5
C = 14/5

E = (- 5/7)²
E = (- 5²/7²)
E = 25/49