Calcule et donne le résultat sous la forme d'une fraction la plus simple possible : A= 6/7-4/7x5/2 B= 2/3-3/2x 4/9 + 1/2 C= (
Mathématiques
FaZeTumperrr
Question
Calcule et donne le résultat sous la forme d'une fraction la plus simple possible :
A= 6/7-4/7x5/2 B= 2/3-3/2x 4/9 + 1/2
C= (2-1/3)+(5+5/6) D= 2/5/7/3-10
Je suis en 4eme je galere trop :'( merci
A= 6/7-4/7x5/2 B= 2/3-3/2x 4/9 + 1/2
C= (2-1/3)+(5+5/6) D= 2/5/7/3-10
Je suis en 4eme je galere trop :'( merci
2 Réponse
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1. Réponse maudmarine
Calcule et donne le résultat sous la forme d'une fraction la plus simple possible :
A = 6/7 - 4/7 x 5/2
A = 6/7 - 4 x 5
7 x 2
A = 6/7 - 20/14
A = 6 x 2 / 7 x 2 - 20/14
A = 12/14 - 20/14
A = - 8/14
A = 2 x - 4 / 2 x 7
A = - 4/7
B = 2/3 - 3/2 x 4/9 + 1/2
B = 2/3 - 3 x 4 + 1/2
2 x 9
B = 2/3 - 12/18 + 1/2
B = 2 x 6 / 3 x 6 - 12/18 + 1 x 9 / 2 x 9
B = 12/18 - 12/18 + 9/18
B = 9/18
B = 9 x 1 / 9 x 2
B = 1/2
C = (2 - 1/3) + (5 + 5/6)
C = (2 x 3 / 1 x 3 - 1/3) + (5 x 6 / 1 x 6 + 5/6)
C = (6/3 - 1/3) + (30/6 + 5/6)
C = 5/3 + 35/6
C = 5 x 2 / 3 x 2 + 35/6
C = 10/6 + 35/6
C = 45/6
C = 3 x 15 / 3 x 2
C = 15/2
D = 2/5/7/3 - 10
D = 2/5 : 7/3 - 10
D = 2/5 x 3/7 - 10
D = 2 x 3 - 10
5 x 7
D = 6/35 - 10
D = 6/35 - 10 x 35 / 1 x 35
D = 6/35 - 350/35
D = 344/35 -
2. Réponse adami976
A= 6/7-4/7x5/2 B= 2/3-3/2x 4/9 + 1/2 C= (2-1/3)+(5+5/6)
= 6/7- 20/14 = 2/3- 12/18 +1/2 = 1/3 + 10/6
= 6*2/7*2 -20/14 = 2*6/3*6- 12/18 +1/2 = 1*2/3*2 +10/6
= 12/14 -20/14 = 12/18 -12/18 +1/2 = 2/6 +10/6
= 12-20/14 = 0 +1/2 = 2 +10/6
= -8/14 = -4/7 = 1/2 = 12/6 = 6/3 = 2/1
D= 2/5/7/3-10
=6/35 -10
= 6/35 -10*35/1*35
= 6/35 - 350/35
= 6-350/35
= -344/35