Réponse :

bonjour!

Explications étape par étape :

D = (-7)+(+10)+(+5)+(-1)-(-2)

=-7 +10 +5 -1 +2

=17 -8

=9

E = -2,5+4-3-7+2

=4+2 -3-7-2.5

= 6 -12.5

=-6.5

F = 3+4 -5 -25 +11

=3+4+11 -5-25

=18 -30

= -12

Verified answer

Bonjour,

++ = +

-- = +

+- = -

-+ = -

D = (-7)+(+10)+(+5)+(-1)-(-2)

= -7 + 10 + 5 - 1 + 2

= (-7 - 1) + (10 + 5 + 2)

= -8 + 17

= 9

E = -2,5+4-3-7+2

= (-2,5 -3 - 7) + (4 + 2)

= -12,5 + 6

= -6,5

F = 3+4 -5 -25 +11

= (-5 - 25) + (3 + 4 + 11)

= -30 + 18

= -12