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Sagot :

3.

A = 3 × (2x + 4)

A= 6x + 12

B= a (3-2a)

B= 3a - 2a²

C= -2(2a +1)

C= -4a -2

D= -3x (4x -2)

D= -12x² + 6x

4.

A=2 × b + 2 × 4

A= 2( b+ 4)

B=12x + 20

B=4(3x+5)

C=5y-15

C=5(y-3)

D=3x² + 9x

D= 3x(x+3)

(pas le signe multipler, la lettre x)

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