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x+my+6=0 ①
(m-2)x+3y+2m=0 ②
①*(m-2) - ②
[m(m-2)-3]y=-6m+12+2m=12-4m
∴ y=(-4m+12)/(m²-2m-3)>0,
(m-3)/(m-3)(m+1)<0
∴ m<-1
①*3-②*m
(3-m²+2m)x=-18+2m²
x=(2m²-18)/(3-m²+2m)>0
(2m²-18)/(m²-2m-3)<0
∴ 2(m-3)(m+3)/[(m-3)(m+1)]<0
∴ 2(m+3)/(m+1)<0
∴ -3<m<-1
综上,m的取值范围是 -3<m<-1
(m-2)x+3y+2m=0 ②
①*(m-2) - ②
[m(m-2)-3]y=-6m+12+2m=12-4m
∴ y=(-4m+12)/(m²-2m-3)>0,
(m-3)/(m-3)(m+1)<0
∴ m<-1
①*3-②*m
(3-m²+2m)x=-18+2m²
x=(2m²-18)/(3-m²+2m)>0
(2m²-18)/(m²-2m-3)<0
∴ 2(m-3)(m+3)/[(m-3)(m+1)]<0
∴ 2(m+3)/(m+1)<0
∴ -3<m<-1
综上,m的取值范围是 -3<m<-1
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