Answered

bonjour ! pouvez-vous m'aider sur un exercice de maths?
calculer les expressions suivantes(avec toutes les etapes de calcul):
a)1/3+2/3÷5/7
b)5/4-3/2÷-2/5+1/4
c)-7/3×2/7÷-3/7×14/3
d)-2÷5/12-3/4
e)2-4/3÷-2
f)9/2×(7/9-5/12)

Sagot :

Bonsoir,

a)1/3+2/3÷5/7

= 1/3 +2/3 * 7/5

= 1/3 +14 /15

= 5/15 + 14/15

= 19/15

b)5/4-3/2÷-2/5+1/4

= 4 - 3/2* 5/2 +1/4

=  4- 15/4 +1/4

= 16/4 -15/4 +1/4

= 2/4

= 1/2

c)-7/3×2/7÷-3/7×14/3

=-7/3 * 2/7 *7/3 *14/3

= - 1 372/3

d)-2÷5/12-3/4

= -2 *12/5 -3/4

= -24/5 -3/4

= -96/20 - 15/20

= -81/20

e)2-4/3÷-2

= 2- 4/3 * -1/2

= 2+4/6

= 12/6 +4/6

=20/6

= 10/3

f)9/2×(7/9-5/12)

9/2 *( 28/36 - 15/36)

= 9/2 * 13/36

= 117/72

=39/24

= 13/ 8