Pouvez vous m’aider au 88 svp ?

Bonsoir,

A= -4/15 +7/2

=  -8/30 + 105/30

= 97/30

B=

13/7 - 8/7 = 5/7

5/7-4 /5

= 25/3 - 28/35

= -3/35

C=

(15/10 + 6/10) ( 15/12 - 16/12)

=  21/10 *( -1/12)

= -21/ 120  = -7/40

D=

-3/8 -35/72

= -27/72 -35/72

=- 62/72 = -31/36

Excuse-moi, j'avais oublié des signes négatifs.

A=1/5×(-4/3)+7/2

=(-4)/15+7/2

=(-8+105)/30

=97/30

B=13/7+(-8/7)+(-4/5)

=(65-40-28)/35

=-3/35

C=(3/2+3/5)(5/4-4/3)

=((15+6)/10)((15-16)/12

=21/10×(-1/12)

=-21/120

=(-21÷3)/(120÷3)

=-7/40

D=-3/8-5/8×7/9

=-3/8-35/72

=(-27-35)/72

=-62/72

=(-62÷2)/(72÷2)

=-31/36