Réponses

Meilleure réponse !
2014-03-23T10:52:59+01:00
A= 5/24 - 1/24
A= 4/24
A= 4x1 / 6x4
A= 1/6

B= 20/14 + 1/2
B= 20/14 + 1x7 / 2x7
B= 20/14 + 7/14
B= 27/14

C= 15/14 x 21/45
C= 315/630
C= 315x1 / 315x2
C= 1/2

D= (5/12 - 1/4) x (24/21 + 1)
D= (5/12 - 1x3 / 4x3) x (24/21 + 1x21 / 1x21)
D= (5/12 - 3/12) x (24/21 + 21/21)
D= 2/12 x 45/21
D= 90/252
D= 18x5 / 18x14
D= 5/14
2014-03-23T10:58:40+01:00
A= 5/24-1/24.
A=(5-1)/24
A=4/24
A=4/(4x6)
A=1/6

B= 20/14+1/2
B=20/14+7/(2x7)
B=(20+7)/14
B=27/14

C=15/14x21/45.
C=(15x21)/(14x45)
C=(5x3x3x7)/(2x7x3x3x5)
C=1/2

D=(5/12-1/4) x (24/21+1)
D=(5/12-3/12)(24/21+21/21=
D=2/12x45/21
D=2x45/21x12
D=(2x3x15)/(7x3x2x2x3)
D=15/42