Pouvez vous m'aider merci 5+3/4= -6/7+7/2= 9/10-2/3-13/6= 7/5-6/5×7/12= 7×45/21×6/25= 26/49×(-35/13)= 18/-55×77/-27×5/-14=

Réponse :

bonsoir

5+3/4=20/4+3/4=23/4

-6/7+7/2=-12/14+49/14=37/14

9/10-2/3-13/6=27/30-20/30-65/30=-58/30=-29/15

7/5-6/5×7/12=7/5-42/60=84/60-42/60=42/60=7/10

7×45/21×6/25=1890/525=18/5

26/49×(-35/13)=-910/637=-10/7

18/-55×77/-27×5/-14=6930/-20790=1/-3

Explications étape par étape

Bonsoir,

5+3/4

= (5 x 4) / (1 x 4) + 3/4

= 20/4 + 3/4

= 23/4

-6/7+7/2=

= (- 6 x 2) / (7 x 2) + (7 x 7) / (2 x 7)

= - 12/14 + 49/14

= 37/14

9/10-2/3-13/6

= (9 x 3) / (10 x 3) - (2 x 10) / (3 x 10) - (13 x 5) / (6 x 5)

= 27/30 - 20/30 - 65/30

= - 58/30

= (2 x - 29) / (2 x 15)

= - 29/15

7/5-6/5×7/12

= 7/5 - 42/60

= (7 x 2) / (5 x 2) - (6 x 7)  / (6 x 10)

= 14/10 - 7/10

= 7/10

7×45/21×6/25=

= 315/21 x 6/25

= 1890/525

= (105 x 18) / (105 x 5)

= 18/5

26/49×(-35/13)

= - 910/637

= (91 x - 10) / (91 x 7)

= - 10/7

18/-55×77/-27×5/-14

= 1386/1485 x - 5/14

= - 6930/20790

= (6930 x - 1) / (6930 x 3)

= - 1/3.