calcule astucieusement chaque expression : A= (-8)+(+6)-(-7)-(+9)-(-2) B= -15+8-(-6)-4+9 C=(-3+4)-(-7+6)+(-8-2) D=(-10.78)+(2.75)+(1.75)+(+10.78)

A = -8+6+7-9+2
A = -2-2+2 = -2

B = -15+8+6-4+9
B = -15+8+2+9
B = -15+10+9
B = -5+9
B = 4

C = 1 - (-1) + (-10)
C = 1+1-10
C = 2-10
C = -8

D = -10,78+2,75+1,75+10,78
D = -10,78+10,78+2,75+1,75
D = 0+2,75+1,75
D = 4,5

Bonjour,

A= (-8)+(+6)-(-7)-(+9)-(-2)
A=-8+6+7-9+2=
A=-17+15
A=-2


B= -15+8-(-6)-4+9
B=-15+8+6-4+9
B=-19+23
B=4


C=(-3+4)-(-7+6)+(-8-2)
C=1+1-10
C=-10+2
C=-8


D=(-10.78)+(2.75)+(1.75)+(+10.78)
D=-10,78+2,75+1,75+10,78
D=4,50

N'oublie pas la politesse.