一、选择题 1.已知点F,、F:是定点且}FIF:}一6,动点M满足}MF,l+}M几 ~6,则M的轨迹为(). A.椭圆B.直线C.圆D.线段 A·“2“·飞。C·92「丫D’几6 5.曲线条十答一1与侨弄分+只祥气~1(k9)有 ‘口沙‘口—化廿—尤 A.长轴B.准线C.焦点D.离心率 6.椭圆多十多一1与子+多一“k0,有 First, multiple-choice questions 1. The known points F, F: are fixed points and}FIF:} -6, the moving points M satisfy }MF,l+}M several ~6, then the trajectory of M is (). A. The ellipse B Straight line C. Circle D. Line A. “2” fly. C · 92 “丫 D’ several 6 5 curve line ten answer one 1 and overseas Chinese get points + only Xiangqi ~ 1 (k9) have ’mouth sand’ mouth - Huayu - especially A. long axis B. Guideline C .Focus D. eccentricity 6. ellipse more than ten more than one 1 and sub + more than one ”k0, there are