espertchristine

Réponse:

exercice 1 :

fraction 1/3 : 10/30 , 4/12, 15/20,

fraction 5/7 : 50/70, 20/28, 15/21

fraction 3/4 : 9/12, 21/28,

exercice 4 :

a. 120/72

b. 30/ 72

c. 12/72

d. 198/72

e. 56/72

f. 144/72

zhulea18 Ex1
10/30=1/3
9/12=3/4
21/28=3/4
50/70=5/7
4/12=1/3
20/28=5/7
15/20=3/4
15/21=5/7
ex2
a 7*7=49 1/7 7/49
b 8*9=72 3/8 27/79
c 4*4=16 4/9 16/36
d 6*7=42 77/42
e 11*7=77 11/5 77/35
f 1*4=4 1/4 4/16
g 11*11=121 6/11 66/121
h 1/1 13/13
i 5*6=30 6/1 30/5
ex4
a 5/3 120/72
b 5/12 30/72
c 1/6 12/72
d 11/4 198/72
e 7/9 56/72
f 2/1 144/72
j en peux plus