mx^2+m-2=2mx-x^2
(m+1)x^2-2mx+m-2=0
(1) 当m=-1时,原式为
-2mx+m-2=0
则x=(m-2)/(2m)
(2) 当m≠-1时,上述方程为一元二次方程
△=4m²-4(m+1)(m-2)
=4m²-4(m²-m-2)
=8-4m
(3) 当△≥0即m≤2时,方程有解
当m=2时,
方程解为m/(m+1)=2/3
当m
mx^2+m-2=2mx-x^2
(m+1)x^2-2mx+m-2=0
(1) 当m=-1时,原式为
-2mx+m-2=0
则x=(m-2)/(2m)
(2) 当m≠-1时,上述方程为一元二次方程
△=4m²-4(m+1)(m-2)
=4m²-4(m²-m-2)
=8-4m
(3) 当△≥0即m≤2时,方程有解
当m=2时,
方程解为m/(m+1)=2/3
当m