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Sagot :

Bonjour,

a)

-6x -15

b)

distributivité

-28x + 42

7*-4x =  -28x

7*6 = 42

c)

y²  -7y

d)

20t -15

e)

6x  -8x²

f)

 2b+ 10 + ab + 5a

g)

double distributivité

ax +ay - bx -by

a*x = ax

a*y = ay

-b* x = -bx

-b* y = -by

h)

ab  -5a  -3b  +15

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