Bonjour

Exercice 11

A = (5/5-1/5)(5/5-2/5)(5/5-3/5)(5/5-4/5)(5/5-5/5)(5/5-6/5)

A = (4/5)(3/5)(2/5)(1/5)(0)(-1/5)

A = 0

B = (2 -2/2)(2-3/3)(2-4/4)(5/5-2)(5/5-2)

= (2-1)(2-1)(2-1)(1-2)(1-2)

= (1)(1)(1)(-1)(-1)

= 1

Exercice 12

A )

3x-7/15 = -21/15 = -7/5

B )

7/15 x -15/3 = -7/3

Opposé 7/3

C)

5/11 x 11/15 x 2

5/15 x 2

1/3 x 2

2/3

D)

-7/10 x 2/10 = -14/100 = -7 /50

E)

-7/10 + 4/5 =- 7/10 + 8/10 = 1/10 =

Inverse 10

F)

7/15 x -15/4 = -7/4

Inverse -4/7

G)

- 7/15 x -15/2 = 7/2

Opposé -7/2

H)

-7/2( -7/3 x -3/2)

-7/2(-7/2)

49/4