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Sagot :

Réponse:

ex 19

A= -6x×3x-2×4x

-18ײ-8×

B= 7×2ײ-5x×4x

14x²-20x²

-6x²

C= -4x×6x+2×12x²

-24x²+24x²

0

E= -5×3x-3×2x²+4×4x²+2×3x

-15x-6x²+16x²+6x

-9x+10x²

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