已知mm_5m_1=0,则2mm_5m+1/mm=?

来源:学生作业帮助网 编辑:六六作业网 时间:2024/11/22 15:41:07
已知mm_5m_1=0,则2mm_5m+1/mm=?已知mm_5m_1=0,则2mm_5m+1/mm=?已知mm_5m_1=0,则2mm_5m+1/mm=?由m^2-5m-1=0有m-1/m=5,平方

已知mm_5m_1=0,则2mm_5m+1/mm=?
已知mm_5m_1=0,则2mm_5m+1/mm=?

已知mm_5m_1=0,则2mm_5m+1/mm=?
由m^2-5m-1=0有m-1/m=5,平方可得m^2+(1/m)^2=27,故2m^2-5m+(1/m)^2=m^2+(1/m)^2+m^2-5m=27+1=28.