解
[(4x²-x³-2x)÷2x]-(x-1)²
=(2x-1/2x²-1)-(x²-2x+1)
=2x-1/2x²-1-x²+2x-1
=(-1/2x²-x²)+(2x+2x)+(-1-1)
=-3/2x²+4x-2