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Sagot :

AFTERSHOCK
J = 7x²+3x+2x²-5x  
J = 9x²-2x

K = 3(2a-4b)-5(-2a-b)  
K = 6a-12b+10a+5b
K = 16a-7b

L = (2x+3)(5x-1)
L = 10x²-2x+15x-3
L = 10x²+13x-3
DROOPETTE
J=7x²+3x+2x²-5x  
=9x²-2x
=x(9x-2)


K = 3(2a-4b)-5(-2a-b)  
=6a-12b+10a+5b
=16a-7b

L=(2x+3)(5x-1)
=10x²-2x+15x-3
=10x²+13x-3

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