^是乘号的意思吗?
3X*2-X-1=0
5X=1
X=0.2
3X*4+12X*3-11X*2-4X+2001=12X+36X-22X-4X+2001
=22x+2001
=22*0.2+2001
=4.4+2001
=2005.4