1.(2x-1)(4x²+2x+1))2.(x-1)(x²+x)

问题描述:

1.(2x-1)(4x²+2x+1))
2.(x-1)(x²+x)

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