6:
\(F=-3\left(2x^2-15x-8\right)-\left(-3x^2+2x-15x+10\right)-4x^2+24x\)
\(=-6x^2+45x+24+3x^2+13x-10-4x^2+24x\)
=-7x^2+82x+14
=-7*9-82*3+14=-295
7: \(G=-10x^2+25x+8x-20-7x^3+28x^2-21x+7x^3-2x^2-28x^2+8x\)
=-12x^2+20x-20
=-12+20-20=-12
9: L=5x(2x^2+3x-2x-3)-10x^3+40x^2-50x-x^2+5x-4
=10x^3+5x^2-15x-10x^3+39x^2-45x-4
=44x^2-60x-4
=44*1/9+20-4=188/9