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A series of the samples La1-x(Sr1-yNay)xMnO3(y=0.0,0.2,0.4,0.6,0.8,1.0)were prepared by the solid-state reaction method.Magnetoresistance enhancement and temperature stability of magnetoresistance in the system La1-x(Sr1-yNay)xMnO3 with unchanged Mn3+/Mn4