Alors voila il me reste 7 calculs a faire et je n'arrive pas a les faire :

1) (-4x-7) X (-3x+5) = ?

2) (-8x-5) X (-3x-4) = ?

3) (-3x+3) X (3x-3) = ?

4) 2 X (x+7) X (2x-1) = ?

5) -(2x-7) X (x+8) = ?

6) (2x+3) X (x-4) + (4x-2) X (x+3) = ?

7) (4x-2) X (2x-3) - (x+5) (2x-4) = ?

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