Ex 46 p86, detaille les calculs svp Classe : 4eme

Je corrige la D ici j'avais mal copié :

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

=(2+3+10+9)/6

=24/6

=(24÷6)/(6÷6)

=4

Bonsoir

Calculer :

A = 7/3 + 11/5

A = (7 x 5)/(3 x 5) + (11 x 3)/(5 x 3)

A = 35/15 + 33/15

A = 68/15

B = 2/7 - 5/9

B = (2 x 9)/(7 x 9) - (5 x 7)/(9 x 7)

B = 18/63 - 35/63

B = -17/63

C = - 5/6 - 7/4

C = (-5 x 2)/(6 x 2) - (7 x 3)/(4 x 3)

C = -10/12 - 21/12

C = -31/12

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

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

D = 2/6 + 3/6 + 10/6 + 9/6

D = (2 + 3 + 10 + 9)/6

D = 24/6

D = (6 x 4)/6

D = 4

E = 7/5 + 13/5 - 3/10 - 7/10

E = (7 x 2)/(5 x 2) + (13 x 2)/(5 x 2) - 3/10 - 7/10

E = 14/10 + 26/10 - 10/10

E = 40/10 - 1

E = (4 x 10)/10 - 1

E = 4 - 1

E = 3