Caculer les nombres suivants en écrivant les calculs intermédiaires et donner le résultat sous la forme d'une fraction la plus simple possible. Aidées moi SVP
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Bonjour,
A = - 13/18 + 7/6
A = - 13/18 + (7 x 3) / (6 x 3)
A = - 13/18 + 21/18
A = 8/18
A = (2 x 4) / (2 x 9)
A = 4/9
B = 7/35 - 8/15
B = (7 x 3) / (35 x 3) - (8 x 7) / (15 x 7)
B = 21/105 - 56/105
B = - 35/105
B = (35 x - 1) / (35 x 3)
B = - 1/35
C = - 5/4 + 2/3 - 7/5
C = (- 5 x 15) / (4 x 15) + (2 x 20) / (3 x 20) - (7 x 12) / (5 x 12)
C = - 75/60 + 40/60 - 84/60
C = - 159/60 + 40/60
C = - 119/60
D = 12/5 : 6/7
D = 12/5 x 7/6
D = 84/30
D = (6 x 14) / (6 x 5)
D = 14/5
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