Répondre :
a/ x(x+6) - 6
=x²+6x-6
b/ x(y-2) + xy
=xy-2x+xy
=2xy-2x
c/ 3x(x+4 ) - 6x²
=3x²+12x-6x²
= -3x²+12x
d/ 9x ( x²-6 ) + 2x²
=9x³-54x+2x²
e/ 5x ( 3+5x ) + x (5+x ) + 4x ( 2x+1)
=15x+25x²+5x+x²+8x²+4x
=34x²+19x
=x²+6x-6
b/ x(y-2) + xy
=xy-2x+xy
=2xy-2x
c/ 3x(x+4 ) - 6x²
=3x²+12x-6x²
= -3x²+12x
d/ 9x ( x²-6 ) + 2x²
=9x³-54x+2x²
e/ 5x ( 3+5x ) + x (5+x ) + 4x ( 2x+1)
=15x+25x²+5x+x²+8x²+4x
=34x²+19x
a/ x²+6x-6
b/ 2xy-2x
c/ -3x²+12x
d/ 9x au cube - 54x+2x²
e/ 34x²+24x
b/ 2xy-2x
c/ -3x²+12x
d/ 9x au cube - 54x+2x²
e/ 34x²+24x