Réduire chaques expression: A=6x+4-8x²-7x+5+3x²
B=-3a+5a²-2a-3-7a²+3
C=3x²-(6x-2x²+1)+(x²-5x)
D=-(2a+1)+4a²+6-(-3a²+a)
E=7-x+(3x²-1)-(3x+2x²)
F=4x-x²-(5-2x)+(6x²-7)
merci de m'aider svp
B=-3a+5a²-2a-3-7a²+3
C=3x²-(6x-2x²+1)+(x²-5x)
D=-(2a+1)+4a²+6-(-3a²+a)
E=7-x+(3x²-1)-(3x+2x²)
F=4x-x²-(5-2x)+(6x²-7)
merci de m'aider svp
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