Sagot :
bonjour
A = ( - 5 ) - ( - 9 )
= - 5 + ( 9)
= - 5 + 9
= 4
B = ( + 8 ) - ( +10 ) = + 8 + ( - 10 ) = 8 - 10 = - 2
C = ( + 10) - ( - 7.5) = + 10 + ( - 7.5) = 10 -7 .5 = 2.5
D = ( - 11.5) - ( + 12.8 ) = - 11. 5 + ( - 12.8) = - 11.5 - 12.8 = - 24.3
A = -5 + ( +9)
B = (+8) + (-10)
C = (+10) + (+7,5)
E=(-11,5) + (-12,8)