有两条相交成π/4的直线EF、MN,交点是O,开始,甲在OE上距O点2km的点A处乙在OM上距O点1km的点B处;现在他们同时以2km/h的速度行走,甲沿EF的方向,乙沿NM的方向,设与OE同向的单位向量为e1,与OM同向的
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![有两条相交成π/4的直线EF、MN,交点是O,开始,甲在OE上距O点2km的点A处乙在OM上距O点1km的点B处;现在他们同时以2km/h的速度行走,甲沿EF的方向,乙沿NM的方向,设与OE同向的单位向量为e1,与OM同向的](/uploads/image/z/8787959-71-9.jpg?t=%E6%9C%89%E4%B8%A4%E6%9D%A1%E7%9B%B8%E4%BA%A4%E6%88%90%CF%80%2F4%E7%9A%84%E7%9B%B4%E7%BA%BFEF%E3%80%81MN%2C%E4%BA%A4%E7%82%B9%E6%98%AFO%2C%E5%BC%80%E5%A7%8B%2C%E7%94%B2%E5%9C%A8OE%E4%B8%8A%E8%B7%9DO%E7%82%B92km%E7%9A%84%E7%82%B9A%E5%A4%84%E4%B9%99%E5%9C%A8OM%E4%B8%8A%E8%B7%9DO%E7%82%B91km%E7%9A%84%E7%82%B9B%E5%A4%84%EF%BC%9B%E7%8E%B0%E5%9C%A8%E4%BB%96%E4%BB%AC%E5%90%8C%E6%97%B6%E4%BB%A52km%2Fh%E7%9A%84%E9%80%9F%E5%BA%A6%E8%A1%8C%E8%B5%B0%2C%E7%94%B2%E6%B2%BFEF%E7%9A%84%E6%96%B9%E5%90%91%2C%E4%B9%99%E6%B2%BFNM%E7%9A%84%E6%96%B9%E5%90%91%2C%E8%AE%BE%E4%B8%8EOE%E5%90%8C%E5%90%91%E7%9A%84%E5%8D%95%E4%BD%8D%E5%90%91%E9%87%8F%E4%B8%BAe1%2C%E4%B8%8EOM%E5%90%8C%E5%90%91%E7%9A%84)
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