一位足球运动员沿着720米的湖边跑了一圈,他前一半时间每秒跑5米,后一半时间每秒跑4米他跑后一半路程用了多少秒?5:4=10:8,10+8=18,720/18=40,40/5=8,40/4=10,10*8=80(秒),80+8=88(秒).上面说的是,
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![一位足球运动员沿着720米的湖边跑了一圈,他前一半时间每秒跑5米,后一半时间每秒跑4米他跑后一半路程用了多少秒?5:4=10:8,10+8=18,720/18=40,40/5=8,40/4=10,10*8=80(秒),80+8=88(秒).上面说的是,](/uploads/image/z/1254821-5-1.jpg?t=%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%E7%9A%84%E6%B9%96%E8%BE%B9%E8%B7%91%E4%BA%86%E4%B8%80%E5%9C%88%2C%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%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%3F5%EF%BC%9A4%3D10%EF%BC%9A8%2C10%2B8%3D18%2C720%2F18%3D40%2C40%2F5%3D8%2C40%2F4%3D10%2C10%2A8%3D80%EF%BC%88%E7%A7%92%EF%BC%89%2C80%2B8%3D88%EF%BC%88%E7%A7%92%EF%BC%89.%E4%B8%8A%E9%9D%A2%E8%AF%B4%E7%9A%84%E6%98%AF%2C)
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