Sagot :

hugo12

Réponse :

Explications étape par étape

bonjour,

1/4+2/3x3/4=1/4+6/12= 1x3/4x3  +6/12 = 3/12+6/12=9/12=3/4

5/3-2/3x3/5+2/3= 5/3-6/15+2/3= 5x5/3x5-6/15+2x5/3x5=

25/15-6/15+10/15=29/15

Bonjour ;

Exercice n° 64 .

a.

1/4 + 2/3 x 3/4

= 1/4 + (2 x 3)/(3 x 4)

= 1/4 + 2/4

= (1 + 2)/4

= 3/4 .

b.

5/3 - 2/3 x 3/5 + 2/3

= 5/3 - (2 x 3)/(3 x 5) + 2/3

= (5 + 2)/3 - 6/15

= 7/3 - 6/15

= (7 x 5)/(5 x 3) - 6/15

= 35/15 - 6/15

= (35 - 6)/15

= 29/15 .

Exercice n° 65 .

F = 4 - 12/5 x 10/3

= 4 - 12/3 x 10/5

= 4 - 4 x 2

= 4 - 8

= - 4 .