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Sagot :

THOMAS756

Bonjour,

a. 5(x+9)=  5x + 5 * 9 = 5x + 45

b. 7(a-4)=  7a + 7 * (-4) = 7a - 28

c. 5(8+b)=  5 * 8 + 5b = 40 + 5b

d. 4(x+7)= 4x + 4 * 7 = 4x + 28

AYUDA

bjr

on sait que   k (a + b) = k * a + k * b

on appliques

5 (x + 9 ) = 5*x + 5*9 = 5x + 45

7(a-4)= 7*a + 7*(-4) = 7a - 28

c.5(8+b)=  5*8 + 5*b = ...

d.4(x+7)=  .. * .. + .. * .. = ...

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