Réponse :

bonjour

Explications étape par étape

A= (+10 ) - (-12)

(+10) +(+12) = 22 ou +22

B = (-21) -(+13)

(-21) +(-13) = -34

C= ( -9) - ( +14)

(-9) + ( - 14) = -23

D = (+12.4) -( -9.7)

(+12.4) + ( +9.7) = 22.10

E = ( -6.5) - ( -7.8)

( -6.5 ) +( +7.8) = 1.3

F = (-17.2) - ( +5.5)

(-17.2) + ( -5.5) = - 22.7

G = (-1.1) - ( +0.2)

( -1.1) + ( - 0.2) = -1.3

H = ( +8.4) - ( -3.9)

(+8.4) +(+3.9) = 12.3

I = ( +3) - ( +3.5)

(+3) + ( -3.5) = - 0.5

J = ( -0.1) - ( -0.1)

(-0.1 ) + ( +0.1) = 0