2.在平面直角坐標(biāo)系xOy中,已知點(diǎn)A(-2,0),B(4,0),M(1,m),動(dòng)點(diǎn)P滿(mǎn)足2|PA|=|PB|,設(shè)動(dòng)點(diǎn)P的軌跡為曲線(xiàn)C,若曲線(xiàn)C上存在兩點(diǎn)E,F(xiàn),使得EM⊥MF,則實(shí)數(shù)m的取值范圍是( ?。?/div>
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發(fā)布:2024/9/27 6:0:3組卷:22引用:2難度:0.5
發(fā)布:2024/9/28 9:0:1組卷:47引用:15難度:0.7