bonjour
a) - 5.6 - ( 3.2) = - 5.6 - 3.2 = - 8.8 °
b) - 4.4 + 7 = -2.6 °
c) 5.5 + 7.5 = 13 °
le 59 ce sont des fractions
a - b + c
= 2 - ( - 5/7) - 1/2
= 28/14 + 10/14 - 7/14
= 31 /14
a - b - c
= 2 - ( - 5/7) - ( - 1/2)
= 28/14 + 10/14 + 7/14
= 35/14
continue
