Calculer A = 5/7 - (3/2 - 5/4) B = (5/8 + - 7/4) = (- 1/3 - 4/3). Exercice 10 calculer : I= 3/2+5/10. J=5,2/3 - 1/6. K= 4/3 -1.

Bonsoir,

Calculer:

Toujours mettre au même dénominateur commun:

A = 5/7 - (3/2 - 5/4)

A= 5/7- (3x2-5)/4

A= 5/7 - 1/4

A= (5x4-1x7)/ (4x7)

A= 13/28

B = (5/8 - 7/4) = (- 1/3 - 4/3)

B= (5-7x2)/ 8= -5/3

B= -9/8+5/3

B= (-9x3+5x8)/ (8x3)

B= 13/24-1/8

I= 3/2+5/10

I= (3x5 + 5)/10

I= 20/10= 2

J=5,2/3 - 1/6

J= (5.2x2 - 1)/ 6

J= ... calcule

K= 4/3 -1

K= (4- 1x3)/4

K= ...calcule

L=2+21/7

L= (2x7 +21) / 7

L= ...calcule