Répondre :
1er = 1/3 le 2ème = 1/4 3ème 2/3 du reste
1/3 + 1/4 = 4/12 + 3/12 = 7/12 12/12 - 7/12 = 5/12 reste
D= 1 - (1/3 +1/4 ) X 2/5
1 - (7/12 X 2/5)
1-( 14/60)
1- 14/60 14/60= 7/30
30/30 -7/30 = 23/30
1/3 + 1/4 = 4/12 + 3/12 = 7/12 12/12 - 7/12 = 5/12 reste
D= 1 - (1/3 +1/4 ) X 2/5
1 - (7/12 X 2/5)
1-( 14/60)
1- 14/60 14/60= 7/30
30/30 -7/30 = 23/30