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sarah227
@sarah227
January 2021
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bonjours je comprend pas l'exercice je suis en 4eme exo: 3 et 4 svp aidez moi svp merci d'avance
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maudmarine
Verified answer
Bonjour,
3)
a) 3/4 : 5/7 = 3/4 x 7/5 =
21/20
b) 9/5 : 6/11 = 9/5 x 11/6 = 99/30 = 3 x 33 / 3 x 10 =
33/10
c) 15/8 : 6 = 15/8 x 1/6 = 15/48 = 3 x 5 / 3 x 16 =
5/16
d) 8/7 : 12 = 8/7 x 1/12 = 8/84= 4 x 2 / 4 x 21 =
2/21
4)
a) 3/7 + 15/7 x 3/2
= 3/7 + 45/14
= 3 x 2 / 7 x 2 + 45/14
= 6/14 + 45/14
= 51/14
b) 9/5 x (1/4 - 5/12)
= 9/5 x (1 x 3 / 4 x 3 - 5/12)
= 9/5 x (3/12 - 5/12)
= 9/5 x - 2/12
= - 18/60
= 6 x - 3 / 6 x 10
= - 3/10
c) (3/8 + 7/5) : (9/4 - 5/3)
= (3 x 5 / 8 x 5 + 7 x 8 / 5 x 8) : (9 x 3 / 4 x 3 - 5 x 4 / 3 x 4)
= (15/40 + 56/40) : (27/12 - 20/12)
= 71/40 : 7/12
= 71/40 x 12/7
= 852/280
= 4 x 213 / 4 x 70
= 213/70
1 votes
Thanks 1
cocobach
Exo 3/
3/4÷5/7=3/4x7/5=21/20
9/5÷6/11=9/5x11/6=99/30=33/10
15/8÷6=15/8x1/6=15/48=5/16
8/7÷12=8/7x1/12=8/84=2/42=1/21
exo4
3/7+15/7x3/2=45/12+3/7=45+6/14=51/14 ici la multiplication est prioritaire
9/5x(1/4-5/12)=9/5x(3-5/12)=9/5x(-2/12)=9/5x(-1/6)=-9/30=-3/10 ici les parenthèses sont prioritaires
(8/8+7/5)÷(9/4-5/3)
=(15+56/40)÷(27-20/12)
=71/40÷7/12
=71/40x12/7
=852/280
=213/70
0 votes
Thanks 1
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Verified answer
Bonjour,3)
a) 3/4 : 5/7 = 3/4 x 7/5 = 21/20
b) 9/5 : 6/11 = 9/5 x 11/6 = 99/30 = 3 x 33 / 3 x 10 = 33/10
c) 15/8 : 6 = 15/8 x 1/6 = 15/48 = 3 x 5 / 3 x 16 = 5/16
d) 8/7 : 12 = 8/7 x 1/12 = 8/84= 4 x 2 / 4 x 21 = 2/21
4)
a) 3/7 + 15/7 x 3/2
= 3/7 + 45/14
= 3 x 2 / 7 x 2 + 45/14
= 6/14 + 45/14
= 51/14
b) 9/5 x (1/4 - 5/12)
= 9/5 x (1 x 3 / 4 x 3 - 5/12)
= 9/5 x (3/12 - 5/12)
= 9/5 x - 2/12
= - 18/60
= 6 x - 3 / 6 x 10
= - 3/10
c) (3/8 + 7/5) : (9/4 - 5/3)
= (3 x 5 / 8 x 5 + 7 x 8 / 5 x 8) : (9 x 3 / 4 x 3 - 5 x 4 / 3 x 4)
= (15/40 + 56/40) : (27/12 - 20/12)
= 71/40 : 7/12
= 71/40 x 12/7
= 852/280
= 4 x 213 / 4 x 70
= 213/70
3/4÷5/7=3/4x7/5=21/20
9/5÷6/11=9/5x11/6=99/30=33/10
15/8÷6=15/8x1/6=15/48=5/16
8/7÷12=8/7x1/12=8/84=2/42=1/21
exo4
3/7+15/7x3/2=45/12+3/7=45+6/14=51/14 ici la multiplication est prioritaire
9/5x(1/4-5/12)=9/5x(3-5/12)=9/5x(-2/12)=9/5x(-1/6)=-9/30=-3/10 ici les parenthèses sont prioritaires
(8/8+7/5)÷(9/4-5/3)
=(15+56/40)÷(27-20/12)
=71/40÷7/12
=71/40x12/7
=852/280
=213/70