x^2+x-1=0 x^2=1-x............1
2x^4+3x^2+2/x^3+2x^2-x
分子：2x^4+2x^2+x^2+2
=2x^2(x^2+1)+x^2+2将1式代入：
=2(1-x)(1-x+1)+1-x+2
=2(1-x)(2-x)+3-x
=2(x^2-3x+2)+3-x
=2(1-x-3x+2)+3-x
=2(-4x+3)+3-x
=-8x+6+3-x
=-9x+9
分母：x^3+2x^2-x
=x(x^2+2x-1)
=x(1-x+2x-1)
=x^2
=1-x
原式=(-9x+9)/(1-x)
=9(1-x)/(1-x)
=9
内容全部来源于网络收集，如有侵权，请联系网站删除：QQ：24596024