Réponse :
Explications étape par étape :
1) 12/5 x 15/4 = 12/4 x 15/5 = 3 x 3 = 9
9 => R
2) 6 / 7 x 3 / 19 = 18 / 136
Le numérateur est 18 => I
3) 42/5 x 5/7 + 5/7 x 21 = 5/5 x 42/7 + 5 x 21/7 = 6 + 5 x 3 = 6 + 15 = 21
21 => F
4) 3/4 x 8/21 x 13/6 x 35/3 x 9/5 = (3 x 8 x 13 x 35 x 9)/(4 x 21 x 6 x 3 x 5) =
3/3 x 8/4 x 35/5 x 9/6 x 13/21 =
2 x 7 x 3/2 x 13/21 =
2/2 x 7 x 3 x 13/21 =
21/21 x 13 = 13
13 => N
5) 5/2 + 3/16 x 24 = 5/2 + 3 x 24/16 =
5/2 + 3 x (8 x 3)/(8 x 2) =
5/2 + 3 x 3/2 =
5/2 + 9/2 = 14/2 = 7
7 => T
6) (2/3 + 4/9) x 216/10 =
(6/9 + 4/9) x (108 x 2)/(5 x 2) =
10/9 x 108/5 = 10/5 x 108/9 = 2 x 12 = 24
24 => C
7) 14/3 x 21/2 - 169/13 * 2 + 3 =
14/2 x 21/3 - [(13 x 13)/13 ] x 2 + 3 =
7 x 7 - 13 x 2 + 3 =
49 - 26 + 3 = 23 + 3 = 26
26 => A
8) dénominateur 11/4 + 1/3 :
11/4 + 1/3 = 33/12 + 4/12 = 37/12
Dénominateur = 12
12 => O
Les lettres sont :
R - I - F - N - T - C - A - O
Ce qui nous donne :
FRACTION
