Répondre :
A=2 (5-3y) + 2y - (2y+5) x 3
=10-6y+2y-6y-15
=-10y-5
B = 3z - 2 (-4z +8) - 4 (3z-1)
=3z+8z-16-12z+4
=-z-12
C = 3- (-5x+4) + 2x (-3x+9) + 2x²
=3+5x-4-6x²+18x+2x²
=-4x²+23x-1
D = 4+2 (3t + 5) + 3t2 ( 4) - (2t +5) x 3
=4+6t+10+12t²-6t-15
=12t²-1
=10-6y+2y-6y-15
=-10y-5
B = 3z - 2 (-4z +8) - 4 (3z-1)
=3z+8z-16-12z+4
=-z-12
C = 3- (-5x+4) + 2x (-3x+9) + 2x²
=3+5x-4-6x²+18x+2x²
=-4x²+23x-1
D = 4+2 (3t + 5) + 3t2 ( 4) - (2t +5) x 3
=4+6t+10+12t²-6t-15
=12t²-1