Explications étape par étape
Exercice 1
2 m = 200 cm
200 * 4/5 = 800/5 = 160
160 * 4/5 = 640/5 = 128
Elle montera à une hauteur de 128 cm soit 1 m 28 cm.
Exercice 2
1 - 6/19 * 3 = 1 - 18/19 = 19/19 - 18/19 = 1/19 = S
1/2 + 1/5 / 5 - 1/2 = 1/5 * 1/5 = 1/25 = Y
27/13 - 2 = 27/13 - 26/13 = 1/13 = M
3/4 * 1/12 = 3/48 = 1/16 = P
11/15 + 2/3 * 4/5 - 4/15 = 7/15 + 8/15 = 15/15 = 1/1 = A
Mot caché : SYMPA !
Exercice 3
A = 24/7 : 8/35 = 24/7 * 35/8 = 840/56 = 15
B = 4 / 2/4 = 4 * 4/2 = 16/2 = 8
C = 20/9 : 35/27 = 20/9 * 27/35 = 540/315 = 12/7
