X＾2-X-1=MX＾2*(2X-M+1)
X＾2-X-1=2MX＾3-M＾2*X＾2+MX＾2
2MX＾3-(1+M＾2+M)X＾2+X+1=0
二次项系数-(1+M＾2+M),一次项系数1,常数项1