bonjour
a:(9-13)×(-2)= - 4 * - 2 = 8
b:5-(-2-3)= = 5 - ( - 5 ) = 5 + 5 = 10
c:-(2-2×4)+4= = - ( 2 - 8 ) + 4 = - ( - 6 ) + 4 = 6 + 4 = 10
d:(7-12)×(-8+4)= - 5 * - 4 = 20
e:5-2×(-3+5)= 5 - 2 * 2 = 5 - 4 = 1
f:[-3-(-7+5)]×(-0,5)= [- 3 - ( - 2) ] * - 0.5 = ( - 3 + 2 ) * - 0.5 = - 1 * - 0.5 = 0.5