Réponse:
A=14x²+8x-21x-12=14x²-13x-12
B=-5x²+20x+3x-12=-5x²+23x-12
C=6xy-27x-14y+63
D=5x+(7x²-6x-28x+24)=12x²-34x+24
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Réponse:
A=14x²+8x-21x-12=14x²-13x-12
B=-5x²+20x+3x-12=-5x²+23x-12
C=6xy-27x-14y+63
D=5x+(7x²-6x-28x+24)=12x²-34x+24