(2x²+3x-1)-4(x²-x+1)

问题描述:

(2x²+3x-1)-4(x²-x+1)
4x²-3x-2-3(2x²+x+2)

(2x²+3x-1)-4(x²-x+1)
=2X²+3X-1-4X²+4X-4
=-2X²+7X-5
=-(X-1)(2X-5)
4x²-3x-2-3(2x²+x+2)
=4x²-3x-2-6X²-3X-6
=-2X²-6X-8
=-2(X²+3X+4)