Réponses

2014-09-10T21:27:45+02:00
A = 7/5 - 3/5 x 4/7
A = 7/5 - 12/35
A = 49/35 - 12/35 = 37/35

B = 3/4 + 5/4 : (4/3-1/2)
B = 3/4 + 5/4 : (8/6 - 3/6)
B = 3/4 + 5/4 : 5/6
B = 3/4 + 5/4 x 6/5
B = 3/4 + 30/20
B = 3/4 + 3/2
B = 3/4 + 6/4
B = 9/4


C = 26 : (-34-(-11-3x7)) -9x8 
C = 26 : ( -34 - (-32)) - 72
C = 26 : (-2) - 72
C = -13-72
C = -85
Merci pan59 pour ton aide !! En plus j'arrive à comprendre ton raisonnement