(-X+2X²+5)+(4X²-3-6X)=?
问题描述:
(-X+2X²+5)+(4X²-3-6X)=?
答
(-X+2X²+5)+(4X²-3-6X)
=-X+2X²+5)+4X²-3-6X
=6x²-7x+2