Sagot :
Réponse :
bonjour
Explications étape par étape :
A = (+7)-(+12)
=7-12
= -5
E=(-9)-(+11)
=-9-11
= -20
L=3-(5-7)
=3-(-2)
=3+2
=5
B = (-7) + (-12)
=-7-12
= -19
F = 4+ (-7)
=4-7
= -3
M=3-(7-5)
=3-2
=1
C = (+5)-(-3)
=5+3
=8
G=-13-(-20)
= -13 + 20
=7
N=-3-(5-7)
= -3 -(-2)
= -3 +2
= -1
D = (+17) - (-17)
=17+17
=34
H = -12 + (-21)
= -12-21
= -33
P=-3-(7-5)
= -3 -(2)
=-3-2
=-5
Explications étape par étape:
apprends ton cours sur l es operations avec signe (a) +(-b)=a-b; (-a)+b =-a+b