设m^2+m-1=0,则m^3+2m^2+99=?

问题描述:

设m^2+m-1=0,则m^3+2m^2+99=?

100啦,m^3+2m^2+99中提出个m乘以(m^2+m)再加上m的二次方,再加上99,由m^2+m-1=0得,m^2+m=1,带入,得到m^2+m+99,就得100啦