若3x2-1=x,求9x4+12x3-2x2-7x+2006的值
问题描述:
若3x2-1=x,求9x4+12x3-2x2-7x+2006的值
答
3x2=6 6-1=5 所以X=5把X代进去就得到9x4+12x3-2x2-7x5+2006
=36+36-4-35+2006
=72-4-35+2006
=68-35+2006
=33+2006
=2039