7. Calculați: a) (2x + 3)[(x+3)(x-2)+(-16x¹): (-4x)³]; b) (x+2)[(32x³-24x): (-8) + 5(x-2)]; c) (x+3)[(15x³-10x): (-5x²)+ 4(x - 1)]; (2x(x-2)-x[5x-3(x+1)]} :(-x); (4x(x + 1)-x[6x-4(x+2)]}: (2x).
Ajutor​