Réponse :

bonjour

Explications étape par étape :

question 1 :

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

question 2:

(+3)+(-3) =0

question 3 :

(+2)-(+4)=-2

question 4:

(+5)-(-2)=7

question 5 :

(-3)-(-5)=2

question 6:

A= (+1)+(-2)+(-1) = -2

question7 :

A= (+1)+(-2)+(-1)= -2

question 8:

B= (-1)+(-2)+(+3)=0

question 9 :

C= (+1 )+(-4)+(+2)=-1

question 10:

D= ( -4)+(+2)+(+2)=-4

question 11 :

A= (+1)-(-2)+(-4)=-1

question 12:

B= (-1)-(+3)+(+4)=0

question 13 :

C= (-2)-(-4)+(-3)=1

question 14:

mardi 7.8°C

question 15 :

mercredi  -4,2°C

question 16 :

7,8-(-4,2)=12

question 17

12°C

question 18 :

(+2)+(-1)=1

question 19 :

-(-4)-(+7)=-3

question 20:

(-6) -(+4)+(+2)=-8

question 21:

A= 2-5+1 = -2

Question 22:

B= -2+3-4=-3

question 23:

C= -2,1+0,1-3,9=-5,9

question 24:

4-(-4)=8

question 25:

9+3+4=16

question 26:

-1,1-0,9+4=2

question 27:

9-3-4=2

question 28:

1,1+0,9-4=-2

question 29:

4-(+4)=0

question 30

4+(-4)=0

question 31

4+(+4)=8

question 32

6+(+3)=9

question 33

6+(-3)=3

question 34

6-(-3)=9

question 35

6-(+3)=3

question 36

9-3+4=10

question 37

3+(-2)=1

question 38

3-(-2)=5

question 39

4+(-3)=1

question40

4-(-3)=7

question 41

7-(-3)+4=14

+et +=+

- et - = +

- et + =-

+ et - = -

j'espère t'avoir aider