设l:3x+-y-1=0和m 3x-y+3=0,动点P到l,m距离相等,求P的轨迹方程.设l 3x-y-1=0,P到l距离根号10,求P的轨迹方程.S设A(3,1),B(-1,-1),C(2,-2),求三角形ABC面积.
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![设l:3x+-y-1=0和m 3x-y+3=0,动点P到l,m距离相等,求P的轨迹方程.设l 3x-y-1=0,P到l距离根号10,求P的轨迹方程.S设A(3,1),B(-1,-1),C(2,-2),求三角形ABC面积.](/uploads/image/z/13401087-15-7.jpg?t=%E8%AE%BEl%EF%BC%9A3x%2B-y-1%3D0%E5%92%8Cm+3x-y%2B3%3D0%2C%E5%8A%A8%E7%82%B9P%E5%88%B0l%2Cm%E8%B7%9D%E7%A6%BB%E7%9B%B8%E7%AD%89%2C%E6%B1%82P%E7%9A%84%E8%BD%A8%E8%BF%B9%E6%96%B9%E7%A8%8B.%E8%AE%BEl+3x-y-1%3D0%2CP%E5%88%B0l%E8%B7%9D%E7%A6%BB%E6%A0%B9%E5%8F%B710%2C%E6%B1%82P%E7%9A%84%E8%BD%A8%E8%BF%B9%E6%96%B9%E7%A8%8B.S%E8%AE%BEA%EF%BC%883%2C1%EF%BC%89%2CB%EF%BC%88-1%2C-1%EF%BC%89%2CC%EF%BC%882%2C-2%EF%BC%89%2C%E6%B1%82%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E9%9D%A2%E7%A7%AF.)
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