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Meilleure réponse !
2013-03-21T22:54:04+01:00

Bonsoir,

 

Exercice 2 :

 

A = 4/3 x (3/10 + 3/5)

A = 4/3 x 3/10 + 4/3 x 3/5

 

B = 2/5 x 13/7 + 2/5 x 1/7

B = 2/5 x (13/7 + 1/7)

 

C = 12 x (7/3 - 5/4)

C = 12 x 7/3 - 12 x 5/4

 

D = 6/5 x 1/2 + 6/5 x 2/3

D = 6/5 x (1/2 + 2/3)

 

Exercice 3 :

 

A = 3a + 2b

A = 3 x 3/4 + 2 x 5/2

A = 9/4 + 5

A = 29/4 = 7,25

 

B = 4ab

B = 4 x 3/4 x 5/2

B = 3 x 5/2

B = 15/2 = 7,5

 

C = (a+b)(b-a)

C = (3/4 + 5/2)(5/2 - 3/4)

C = 13/4 x 7/4

C = 91/16

 

D = 5/3a - 1/6b

D = 5/3 x 3/4 - 1/6 x 5/2

D = 5/4 - 5/12

D = 5/6

 

:)