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2 Calculer: X•A =(-21) + (-7) + (+38) - (-9) •B=(-5) – (-4) + (+3) – (+2) •C= (+9) + (–15) -(-7)–+5) •D=(-6) +(-3) – (-5) + (+10)​

Sagot :

Réponse :

bonjour

Explications étape par étape :

A =(-21) + (-7) + (+38) - (-9)

= -21 -7 +38 +9

=-28 +47

= 19

•B=(-5) – (-4) + (+3) – (+2)

=-5 + 4 +3 - 2

=-7 +7

=0

•C= (+9) + (–15) -(-7)–+5)

=9 - 15 + 7 - 5

=16 - 20

= -4

•D=(-6) +(-3) – (-5) + (+10)​

= -6 -3 +5 +10

=-9 + 15

= 6

VINS

A = - 21 - 7 + 38 + 9

 = 47 - 28

  = 19

B = - 5 + 4 + 3 - 2

   = 7 - 7

  = 0

C = 9 - 15 + 7 - 5

  = 16 - 20

  = - 4

D = - 6 - 3 + 5 + 10

  = 15 - 9

  = 6

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