江苏省连云港市高中数学第2章平面解析几何初步2.3.1空间两点间的距离学案(导学案)苏教版必修2.doc

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江苏省连云港市高中数学第2章平面解析几何初步2.3.1空间两点间的距离学案(导学案)苏教版必修2.doc_第1页
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12.3.1 空间两点间的距离分层训练1空间两点 (2,54)(,3)AB之间的距离等于 ( )()21 1 C7 (D212空间两点 (,)(,)PzQ,且 7P,则 z等于 ( )4 2 6 2 或 63已知空间两点 ,34,5MN,线段 MN的中点为 P,则坐标原点 O到 P点的距离为 ( )()A5()B1 ()C5 ()4以 1,、 27,、 3,2三点为顶点的三角形是 ( )()等腰三角形 ()等边三角形C直角三角形 D等腰直角三角形5 y轴上到点 3,45A距离为等于 8的点的坐标为 6与点 (1,2)M距离等于 3 的点 (,)xyz的坐标满足的条件是 7三角形的三个顶点 (,1、 26B、 (5,02)C,则过 A点的中线长为 8设 P是 x轴上的点,它到点 (0,)P的距离为到点 ,1P的距离的两倍,求点的坐标拓展延伸9如图,正三棱柱 ABC中,底面边长为 1,侧棱长为 3, ,PQ分别是,AB边的中点,求线段 PQ的长ABCQ210若点 G到 ABC三个顶点的距离的平方和最小,则点 G就是 ABC的重心(1)已知 的三个顶点分别为 (3,1)A、 (,05)B、 (1,3),求 的重心 的坐标;(2) 的顶点坐标分别为 ,2xz,(,3)Byz, (,20)x,重心 G的坐标为 (,4),求 ,xyz的值本节学习疑点: 学生质疑教师释疑

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