Réponses

2014-09-20T10:12:47+02:00
A = 1/6+1/12 = 1x2/6x2+1/2 = 2/12+1/12 = 3/12

B = 7/3+5/1 = 7x5/3x5+5x15/1x15 = 35/15+75/15 = 100/15
2014-09-20T10:16:02+02:00
A= 1/6+1/2
A= 1/6+ 1x3/2x3
A=1/6+3/6
A= 4/6= 2/3

B=7/3+ 5
B= 7/3 + 5/1
B= 7/3+ 5x3/1x3
B= 7/3+ 15/3
B= 22/3

C= 12/5-11/15
C= 12x3/5x3 -11/15
C= 36/15-11/15
C= 25/15=5/3

D=5/11-7/11
D= -2/11