Réponses

2014-03-13T20:48:54+01:00
Bonsoir

A = 7/9 +6/9 -1/9 = 12/9 = 4/3
B = 70/10 - 2/10 +3/10 = 71/10
2014-03-13T20:54:27+01:00
A = 7/9 + 2/3 - 1/9
A = 7/9 + 2 x 3 / 3 x 3 - 1/9
A = 7/9 + 6/9 - 1/9
A = 13/9 - 1/9
A = 12/9
A = 3 x 4 / 3 x 3
A = 4/3

B = 7 - 1/5 + 3/10
B = 7 x 10 / 1 x 10 - 1 x 2 / 5 x 2 + 3/10
B = 70/10 - 2/10 + 3/10
B = 68/10 + 3/10
B = 71/10