Bonsoir ,pouvez vous m aider merci beaucoup effectué les 4 calculs suivants en respectant les priorités operatoires: A =1/5 × -4/3 + 7/2. B = 4/5 ÷ -3/7 _7/10. C = 13/7 +(-8/7 ) ÷ ( _4/5) D= 7/3 +3/2 × -10/21. MERCI BEAUCOUP DE VOTRE AIDE
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Bonjour,
A =1/5 × -4/3 + 7/2
A = - 4/15 + 7/2
A = (- 4 x 2) / (15 x 2) + (7 x 15) / (2 x 15)
A = - 8/30 + 105/30
A = 97/30
B = 4/5 ÷ -3/7 _7/10
B = 4/5 x - 7/3 - 7/100
B = - 28/15 - 7/100
B = (- 28 x 20) / (15 x 20) - (7 x 3) / (100 x 3)
B = - 560/300 - 21/300
B = - 581/300
C = 13/7 +(-8/7 ) ÷ ( _4/5)
C = 13/7 - 8/7 x - 5/4
C = 13/7 + 40/28
C = (13 x 4) / (7 x 4) + 40/28
C = 52/28 + 40/28
C = 92/28
C = (4 x 23) / (4 x 7)
C = 23/7
D= 7/3 +3/2 × -10/21.
D = 7/3 - 30/42
D = (7 x 12) / (3 x 12) - 30/42
D = 84/42 - 30/42
D = 54/42
D = (6 x 9) / (6 x 7)
D = 9/7