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Sagot :

CORALIE1008

1.a) ((a+b)×2)+((c+d)×2)

(a+b)×(c+d)

b) tu appliques la double distributivité !

donc : a×c+a×d+b×c+b×d

2) B= 2×1-2×x+x×1-x²

=2-2x+x-x²

= -x²-x+2

C= 2x×1+2x×3x+3×1+3×3x

= 2x+6x²+3+9x

= 6x²+11x+3

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