5. Calculaţi:
a) 2(3x²+x-2) + (-24x6): (-2x²)² - 2(x - 5);
b) 3(2x² − x + 4) + 3(x − 5) + (-96x6) : (-4x²)²;
c) 4[2x³ - 3x(x - 1)]- 2x[x² + 1-3(x - 1)];
d) 2[3x²(x-1)-x(x - 5)]- 3x[2x(x + 1) +3].