点ab分别表示的数是6,-12
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发布时间：2022-04-23 18:26
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时间：2023-09-26 03:56
（ 1 ） 12 、 6 、 3 ； ·················································································································· 3 分 （ 2 ）设 运动 t 秒后，点 P 到点 M 、 N 的距离相等 ． ①若 P 是 MN 的中点，则 t －（－ 12 ＋ 6 t ） ＝ 6 ＋ 2 t － t ， 解得 t ＝ 1 ． ················································································································ 6 分 ②若点 M 、 N 重合，则－ 12 ＋ 6 t ＝ 6 ＋ 2 t ， 解得 t ＝ ． ·············································································································· 8 分 答： 运动 1 或 秒后，点 P 到点 M 、 N 的距离相等 ．
