Réponses

2014-02-09T14:06:14+01:00
A = 7/4 - ( - 1/8 ) - ( 3/10 )
A = 7/4 + 1/8 - 3/10
A = 14/8 + 1/8 - 3/10
A = 15/8 - 3/10
A = 150/80 - 24/80
A = 126/80
A = 63/40

B = 3 + ( 5/7 - 9/14 )
B = 3 + ( 10/14 - 9/14 )
B = 3 + 1/14
B = 42/14 + 1/14
B = 43/14

C = -3/-7 - ( -4/7 x -3/-2 )
C = 3/7 - ( -4/7 x 3/2 )
C = 3/7 - ( -12/14 )
C = 3/7 + 12/14
C = 6/14 + 12/14
C = 18/14 
C = 9/7