Calcule et simplifie au maximum A= -2/3 + 3/7 B= -7/6 × -4/-7 C= 3- 4/9 × 3/2 D= ( -2/3 + 7/3 ): 4/21 svp aidez moi
Mathématiques
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Question
Calcule et simplifie au maximum
A= -2/3 + 3/7
B= -7/6 × -4/-7
C= 3- 4/9 × 3/2
D= ( -2/3 + 7/3 ): 4/21
svp aidez moi
A= -2/3 + 3/7
B= -7/6 × -4/-7
C= 3- 4/9 × 3/2
D= ( -2/3 + 7/3 ): 4/21
svp aidez moi
1 Réponse
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1. Réponse maudmarine
A = -2/3 + 3/7
A = - 2 x 7 / 3 x 7 + 3 x 3 / 7 x 3
A = - 14/21 + 9/21
A = - 5/21
B= -7/6 × -4/-7
B = - 7/6 x 4/7
B = - 28/42
B = 14 x - 2 / 14 x 3
B = - 2/3
C= 3- 4/9 × 3/2
C = 3 - 12/18
C = 3 x 18 / 1 x 18 - 12/18
C = 54/18 - 12/18
C = 42/18
C = 6 x 7 / 6 x 3
C = 7/3
D= ( -2/3 + 7/3 ): 4/21
D = 5/3 : 4/21
D = 5/3 x 21/4
D = 105/12
D = 7 x 15 / 7 x 16
D = 15/16