求高人解答。
2个回答
展开全部
(1)
lg(m^2-2m-2)<>0=lg1
m^2-2m-2<>1
m^2-2m-3<>0
(m-3)(m+1)<>0
m<>3 m<>-1
m^2+3m+2=0
(m+2)(m+1)=0
m=-2 m=-1
∴m=-2
(2)
lg(m^2-2m-2)=0=lg1
m^2-2m-2=1
m^2-2m-3=0
(m-3)(m+1)=0
m=3 m=-1
m^2+3m+2<>0
(m+2)(m+1)<>0
m<>-2 m<>-1
∴m=3
(3)
lg(m^2-2m-2)>0=lg1
m^2-2m-2>1
m^2-2m-3>0
(m-3)(m+1)>0
m>3 或 m<-1
m^2+3m+2<0
(m+2)(m+1)<0
-2<m<-1
∴-2<m<-1
lg(m^2-2m-2)<>0=lg1
m^2-2m-2<>1
m^2-2m-3<>0
(m-3)(m+1)<>0
m<>3 m<>-1
m^2+3m+2=0
(m+2)(m+1)=0
m=-2 m=-1
∴m=-2
(2)
lg(m^2-2m-2)=0=lg1
m^2-2m-2=1
m^2-2m-3=0
(m-3)(m+1)=0
m=3 m=-1
m^2+3m+2<>0
(m+2)(m+1)<>0
m<>-2 m<>-1
∴m=3
(3)
lg(m^2-2m-2)>0=lg1
m^2-2m-2>1
m^2-2m-3>0
(m-3)(m+1)>0
m>3 或 m<-1
m^2+3m+2<0
(m+2)(m+1)<0
-2<m<-1
∴-2<m<-1
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