挑战智商!一位足球运动员沿着720米长的湖边跑了一圈.已知他前一半时间每秒跑5米,后一半时间每秒跑4米,那么他跑后一半路程用了多少秒?设一共用了t秒…得4*t/2+5*t/2=720.解得t=160.则她用5的速
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![挑战智商!一位足球运动员沿着720米长的湖边跑了一圈.已知他前一半时间每秒跑5米,后一半时间每秒跑4米,那么他跑后一半路程用了多少秒?设一共用了t秒…得4*t/2+5*t/2=720.解得t=160.则她用5的速](/uploads/image/z/1086677-53-7.jpg?t=%E6%8C%91%E6%88%98%E6%99%BA%E5%95%86%21%E4%B8%80%E4%BD%8D%E8%B6%B3%E7%90%83%E8%BF%90%E5%8A%A8%E5%91%98%E6%B2%BF%E7%9D%80720%E7%B1%B3%E9%95%BF%E7%9A%84%E6%B9%96%E8%BE%B9%E8%B7%91%E4%BA%86%E4%B8%80%E5%9C%88.%E5%B7%B2%E7%9F%A5%E4%BB%96%E5%89%8D%E4%B8%80%E5%8D%8A%E6%97%B6%E9%97%B4%E6%AF%8F%E7%A7%92%E8%B7%915%E7%B1%B3%2C%E5%90%8E%E4%B8%80%E5%8D%8A%E6%97%B6%E9%97%B4%E6%AF%8F%E7%A7%92%E8%B7%914%E7%B1%B3%2C%E9%82%A3%E4%B9%88%E4%BB%96%E8%B7%91%E5%90%8E%E4%B8%80%E5%8D%8A%E8%B7%AF%E7%A8%8B%E7%94%A8%E4%BA%86%E5%A4%9A%E5%B0%91%E7%A7%92%3F%E8%AE%BE%E4%B8%80%E5%85%B1%E7%94%A8%E4%BA%86t%E7%A7%92%E2%80%A6%E5%BE%974%2At%2F2%2B5%2At%2F2%3D720.%E8%A7%A3%E5%BE%97t%3D160.%E5%88%99%E5%A5%B9%E7%94%A85%E7%9A%84%E9%80%9F)
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