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若关于x的方程x2-4x+m=0没有实数根,则实数m的取值范围是( ) A.m<...
若关于x的方程x2-4x+m=0没有实数根,则实数m的取值范围是( )
A.m<-4
B.m>-4
C.m<4
D.m>4
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