1.(2x-1)(4x²+2x+1))2.（x-1)(x²+x)

1.(2x-1)(4x²+2x+1))2.（x-1)(x²+x)
1.(2x-1)(4x²+2x+1))
2.（x-1)(x²+x)

1.(2x-1)(4x²+2x+1))2.（x-1)(x²+x)
(2x-1)(4x²+2x+1)=(2x)³-1=8x³-1
(x-1)(x²+x)=x(x-1)(x+1)=x(x²-1)=x³-x

(1)8x3-4x2+4x2-2x+2x-1=8x3-1
(2)x3-x2+x2-x=x3-x