ESTEBAN19TORRECILLAS
Answered

bonjour pouvez-vous m'aider s'il vous plaît
simplifie puis effectue la multiplication :
24/25 × 35/36
60/45 × 54/50
25/21 × 14/40
50/56 × 28/15
1/5 × 1/6
5/3 × 3/4
30/13 × 26/20
1/6 × 1/7
4/7 × 7/4
33/15 × 42/63
45/42 × 49/54
38/64 × 72/19
50/51 × 17/60
merci d'avance​

Sagot :

MOZI

Bonjour

24/25 × 35/36 = (2*12 / 5*5) * (7*5 / 3*12) = 2/3 * 7/5 = 14/15

60/45 × 54/50 = 4/3 * 27/25 = 4/3 * 3*9/25 = 4*9/25 = 36/25

25/21 × 14/40 = 5*5/3*7 * 7/4*5 = 5/4 * 1/3 = 5/12

50/56 × 28/15 = 5*5/28 * 28/3*5 = 5/3

1/5 × 1/6 = 1/30

5/3 × 3/4 = 5/4

30/13 × 26/20 = 30/20 * 26/13 = 3/2 * 2 = 3

1/6 × 1/7 = 1/42

4/7 × 7/4 = 1

33/15 × 42/63 = 11*3/5*3 * 21*2/21*3 = 11/5 * 2/3 = 22/15

45/42 × 49/54 = 9*5/7*6 * 7*7/9*6 = 5/6 * 7/6 = 35/36

38/64 × 72/19 = 2*19/8*8 * 8*9/19 = 2 * 9/8 = 9/4

50/51 × 17/60 = 50/60 * 17/3*17 = 5/6 * 1/3 = 5/18