Réponses

2014-04-05T16:03:36+02:00
A) 2/3 x 3/7 x 5/11
= 6/21 x 5/11
= 30/231
= 3 x 10 / 3 x 77
= 10/77

b) 3/5 x 13/7 x 5/2
= 39/35 x 5/2
= 195/70
= 5 x 39 / 5 x 14
= 39/14

c) 3/2 x 2/5 x 3/11
= 6/10 x 3/11
= 18/110
= 2 x 9 / 2 x 55
= 9/55

d) 6/5 x 1/14 x 7/3
= 6/70 x 7/3
= 42/210
= 42 x 1 / 42 x 5
= 1/5

e) 45/6 x 1/9 x 18/7
= 45/54 x 18/7
= 810/378
= 54 x 15 / 54 x 7
= 15/7

f) 6 x 1/88 x 11/22
= 6/88 x 11/22
= 66/1936
= 22 x 3 / 22 x 88
= 3/88

g) 5,5/3 x 9/7,7
= 49,5/23,1
= 49,5 x 10 / 23,1 x 10
= 495/231
= 33 x 15 / 33 x 7
= 15/7

h) 6 x 2,8/3 x 5/0,7
16,8/3 x 5/0,7
= 84/2,1
= 84 x 10 / 2,1 x 10
= 840/21
= 21 x 40 / 21 x 1
= 40/1
= 40

i) 0,6 x 2/3,6
= 1,2/3,6
= 1,2 x 10 / 3,6 x 10
= 12/36
= 12 x 1 / 12 x 3
= 1/3

j) 17/12,5 x 2,5/1,7
= 42,5/21,25
= 42,5 x 100 / 21,25 x 100
= 4250/2125
= 2125 x 2 / 2125 x 1
= 2/1
= 2
Meilleure réponse !
2014-04-05T16:09:37+02:00
Salut :)

a) 2/3 x 3/7 x 5/11
2/7 x 5/11
10/77

b) 3/5 x 13/7 x 5/2
3/2 x 13/7
39/14

c) 3/2 x 2/5 x 3/11
3/5 x 3/11
9/55

d) 6/5 x 1/14 x 7/3
3x2/5 x 1/7x2 x 7/3
1/5

e) 45/6 x 1/9 x 18/7
9x5/6 x 1/9 x 6x3/7
15/7

f) 6 x 1/88 x 11/12
2x3 x 1/11x8 x 11/4x3
2/32
1/16

g) 5.5/3 x 9/7.7
55x0.1/3 x 3x3/77x0.1
165/77 = 11x15/11x7 =  15/7

h) 6 x 2.8/3 x 5/0.7
2x3 x 0.7x4/3 x 5/0.7
40

i) 0.6 x 2/3.6
0.6/1 x 2/0.6x3x2
1/3

j) 17/12.5 x 2.5/1.7
17/2.5x5 x 2.5/17x10
1/0.5 = 2

J'espère t'avoir aidé(e) ! :)