1.已知P、Q分别是椭圆9x²+4y²=36的两个焦点,点M在双曲线9x²-25y²+225上,求△PQM重心轨迹.2.过A(1,1)作双曲线x²-4y²=16的弦,此弦被A平分,求这条弦所在直线方程.3.过P(-2,2)的
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![1.已知P、Q分别是椭圆9x²+4y²=36的两个焦点,点M在双曲线9x²-25y²+225上,求△PQM重心轨迹.2.过A(1,1)作双曲线x²-4y²=16的弦,此弦被A平分,求这条弦所在直线方程.3.过P(-2,2)的](/uploads/image/z/3136493-29-3.jpg?t=1.%E5%B7%B2%E7%9F%A5P%E3%80%81Q%E5%88%86%E5%88%AB%E6%98%AF%E6%A4%AD%E5%9C%869x%26sup2%3B%2B4y%26sup2%3B%3D36%E7%9A%84%E4%B8%A4%E4%B8%AA%E7%84%A6%E7%82%B9%2C%E7%82%B9M%E5%9C%A8%E5%8F%8C%E6%9B%B2%E7%BA%BF9x%26sup2%3B-25y%26sup2%3B%2B225%E4%B8%8A%2C%E6%B1%82%E2%96%B3PQM%E9%87%8D%E5%BF%83%E8%BD%A8%E8%BF%B9.2.%E8%BF%87A%EF%BC%881%2C1%EF%BC%89%E4%BD%9C%E5%8F%8C%E6%9B%B2%E7%BA%BFx%26sup2%3B-4y%26sup2%3B%3D16%E7%9A%84%E5%BC%A6%2C%E6%AD%A4%E5%BC%A6%E8%A2%ABA%E5%B9%B3%E5%88%86%2C%E6%B1%82%E8%BF%99%E6%9D%A1%E5%BC%A6%E6%89%80%E5%9C%A8%E7%9B%B4%E7%BA%BF%E6%96%B9%E7%A8%8B.3.%E8%BF%87P%EF%BC%88-2%2C2%EF%BC%89%E7%9A%84)
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