已知直线l的参数方程为x=1-根号2分之2t,y=4-根号2分之2t,(t为参数)曲线的方程为x方+y方-4y=0.直线与圆相交于AB两点,m(-1,2)设AB中点为P 问(1)lmAl·lmBl(2)lmPl(3)lABl(4)lmAl+lmBl
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![已知直线l的参数方程为x=1-根号2分之2t,y=4-根号2分之2t,(t为参数)曲线的方程为x方+y方-4y=0.直线与圆相交于AB两点,m(-1,2)设AB中点为P 问(1)lmAl·lmBl(2)lmPl(3)lABl(4)lmAl+lmBl](/uploads/image/z/3600411-51-1.jpg?t=%E5%B7%B2%E7%9F%A5%E7%9B%B4%E7%BA%BFl%E7%9A%84%E5%8F%82%E6%95%B0%E6%96%B9%E7%A8%8B%E4%B8%BAx%3D1-%E6%A0%B9%E5%8F%B72%E5%88%86%E4%B9%8B2t%2Cy%3D4-%E6%A0%B9%E5%8F%B72%E5%88%86%E4%B9%8B2t%2C%EF%BC%88t%E4%B8%BA%E5%8F%82%E6%95%B0%EF%BC%89%E6%9B%B2%E7%BA%BF%E7%9A%84%E6%96%B9%E7%A8%8B%E4%B8%BAx%E6%96%B9%2By%E6%96%B9-4y%3D0.%E7%9B%B4%E7%BA%BF%E4%B8%8E%E5%9C%86%E7%9B%B8%E4%BA%A4%E4%BA%8EAB%E4%B8%A4%E7%82%B9%2Cm%EF%BC%88-1%2C2%EF%BC%89%E8%AE%BEAB%E4%B8%AD%E7%82%B9%E4%B8%BAP+%E9%97%AE%EF%BC%881%EF%BC%89lmAl%C2%B7lmBl%EF%BC%882%EF%BC%89lmPl%EF%BC%883%EF%BC%89lABl%EF%BC%884%EF%BC%89lmAl%2BlmBl)
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