Exercice 5 svp Consigne : Calculez de manière ASTUCIEUSE les fractions suivante Merciii svp c pour demain

Réponse :

EXERCICE 4

1.

*69 : 3 × 23.

*1 150 : 10*115=5*2*5*23 =2*5²*23

*4 140 : 10*414  =5*2*2*207=5*2²*9*23 =2²*3²*5*23

2. 23

EXERCICE 5

a. -6/7 - 4/3 - 1/7 - 2/3 = -1 6 2 = -3

*-6/7 - 1/7 = -7/7 = -1

*-4/3 - 2/3 = -6/3 = -2

b. 3/8 + -121/11 - 5/8 + 55/5 = 484/11 - (1x11)/(4x11) = 484/11 - 11/44 = 473/11

*3/8 - 5/8 = - 2/8 = -1/4

*-121/11 + 55/5 = - 121/11 + (55x11)/(5x11) = -121/11 + 605/11 = 484/11

c. -6/5 x 4/3 x 1/6 x 3/4 = -1/5 x 1 = -1/5

*-6/5 x 1/6 = -6/30 = -1/5

*4/3 x 3/4 = 12/12 = 1

d. 3 x -42/25 x 5/-6 x -5/7 =

*3 x -42/25 = -126/25

*5/-6 x -5/7 = -25/42

Explications étape par étape