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4x³-20x²+25x-4x²+20x-25-9x³-6x²-x-9x²-6x-1-x³+1 = -6x³-39x²+38x-25
b) (2x-1)³ - (x + 1)³ + (x+2)³-(x+2)(x²-2x+4) =
8x³-3*4x²*1+3*2x*1-1-(x³+3*x²*1+3*x*1+1)+x³+3*x²*2+3*x*4+8-(x³-2x²+4x+2x²-4x+8)= 8x³-3*4x²*1+3*2x*1-1-x³-3*x²*1-3*x*1-1+x³+3*x²*2+3*x*4+8-x³+2x²-4x-2x²+4x-8=
8x³-12x²+6x-1-x³-3x²-3x-1+x³+6x²+12x+8-x³+2x²-4x-2x²+4x-8 =
7x³-9x²+15x-2
=(4x²-20x+25)(x-1)-(9x²+6x+1)(x+1)-(x³+x²+x-x²-x-1)=
=4x³-4x²-20x²+20x+25x-25-9x³-9x²-6x²-6x-x-1-x³+1=
=-6x³-39x²-38x-25
b) (2x-1)³ - (x + 1)³ + (x+2)³-(x+2)(x²-2x+4)=
=8x³-12x²+6x-1-(x³+3x²+3x+1)+x³+6x²+12x+8-(x³-2x²+4x+2x²-4x+8)=
=9x³-6x²+18x+7-x³-3x²-3x-1-x³-8=7x³-9x²+15x-2