2x的3次方-x方-2x+1

问题描述:

2x的3次方-x方-2x+1

2x的3次方-x方-2x+1
=X平方(2x-1)-(2x-1)
=(2X-1)(X平方-1)
=(2X-1)(X+1)(X-1)

2x的3次方-x方-2x+1
=2x的3次方-2x-x方+1
=2x(x平方-1)-(x平方-1)
=(2x-1)(x平方-1)
=(2x-1)(x+1)(x-1)

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