㎡-2m的绝对值=1,怎么解?
2个回答
展开全部
m^2-2m<0
m(m-2)<0
0<m<2
|m^2-2m|=1
case 1: 0<m<2
|m^2-2m|=1
-(m^2-2m)=1
m^2-2m+1=0
(m-1)^2=0
m=1
solution for case 1: m=1
case 2: m≤0 or m≥2
|m^2-2m|=1
(m^2-2m)=1
m^2-2m-1=0
m=1+√2 or 1-√2
solution for case 2: m=1+√2 or 1-√2
ie
|m^2-2m|=1
m=1 or 1+√2 or 1-√2
m(m-2)<0
0<m<2
|m^2-2m|=1
case 1: 0<m<2
|m^2-2m|=1
-(m^2-2m)=1
m^2-2m+1=0
(m-1)^2=0
m=1
solution for case 1: m=1
case 2: m≤0 or m≥2
|m^2-2m|=1
(m^2-2m)=1
m^2-2m-1=0
m=1+√2 or 1-√2
solution for case 2: m=1+√2 or 1-√2
ie
|m^2-2m|=1
m=1 or 1+√2 or 1-√2
推荐律师服务:
若未解决您的问题,请您详细描述您的问题,通过百度律临进行免费专业咨询