题目已知x1x_{1}x1,x2x_{2}x2是关于xxx的方程x2−(m−1)x−m=0x^{2}-\left(m-1\right)x-m=0x2−(m−1)x−m=0的两个根,且x1+x2=3x_{1}+x_{2}=3x1+x2=3,则mmm的值是____.知识点：根的判别式章节：未标注
