
当m为何值时,方程2x的平方-(4m+1)x+2m的平方-1=0
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2x^2-(4m+1)x+2m^2-1=0
1.b^2-4ac>0
(4m+1)^2-4*2*2m^2=16m^2+8m+1-16m^2=8m+1>0
m>-1/8
2.b^2-4ac=0
(4m+1)^2-4*2*2m^2=16m^2+8m+1-16m^2=8m+1=0
m=-1/8
3.b^2-4ac<0
(4m+1)^2-4*2*2m^2=16m^2+8m+1-16m^2=8m+1<0
m<-1/8
1.b^2-4ac>0
(4m+1)^2-4*2*2m^2=16m^2+8m+1-16m^2=8m+1>0
m>-1/8
2.b^2-4ac=0
(4m+1)^2-4*2*2m^2=16m^2+8m+1-16m^2=8m+1=0
m=-1/8
3.b^2-4ac<0
(4m+1)^2-4*2*2m^2=16m^2+8m+1-16m^2=8m+1<0
m<-1/8
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