5x2+4-3x2-5x-2x2-5+6x.
问题描述:
5x2+4-3x2-5x-2x2-5+6x.
答
原式=(5-3-2)x2+(-5+6)x+(4-5)
=x-1
5x2+4-3x2-5x-2x2-5+6x.
原式=(5-3-2)x2+(-5+6)x+(4-5)
=x-1