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GGDU19

Bonjour

A=-31+18(x+2)

  =-31+18x+36

A=18x+5

B=(6x+4)×3-7

 =18x+12-7

B=18x+5

C=17-6(-3a+2)

 =17+18a-12

C=18a+5

D=(9b-2)×2+9

  =18b-4+9

D=18b+5

Donc A=B=C=D

DIMITRISAMUEL10

Explications étape par étape:

A=-31+18(x+2)

=18x+36-31

=18x+5

B=(6x+4)×3-7

=18x+12-7

=18x+5

C=17-6 (-3a+2)

=18a+17-12

=18a+5

D=(9b-2)×2+9

=18b-4+9

=18b+5

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