Réponses

2014-01-30T19:08:58+01:00
A = 3 - 1/4
A = 3 x 4 / 1 x 4 - 1/4
A = 12/4 - 1/4
A = 11/4

B = 3/2 - 1/14 + 5/7
B = 3 x 7 / 2 x 7 - 1/14 + 5 x 2 / 7 x 2
B = 21/14 - 1/14 + 10/14
B = 20/14 + 10/14
B = 30/14
B = 2 x 15 / 2 x 7
B = 15/7

C = 7/9 x 3
C = 7/9 x 3/1
C = 21/9


D = 64/72 x 54/56

D = 3456/4032
D = 576 x 6 / 576 x 7
D = 6/7