精品偷拍一区二区三区,亚洲精品永久 码,亚洲综合日韩精品欧美国产,亚洲国产日韩a在线亚洲

  • <center id="usuqs"></center>
  • 
    
  • Two ferries start at the same time from opposite sides of a river.Each travels at a constant speed,but one is faster tha

    Two ferries start at the same time from opposite sides of a river.Each travels at a constant speed,but one is faster than the other .They pass at a point 720m from the nearest shore.Both boat wait ten minutes before going back.On the return trip they meet 400m from the other shore .
    How wide is the river
    英語人氣:761 ℃時(shí)間:2020-04-19 00:48:40
    優(yōu)質(zhì)解答
    已知:兩船勻速渡河,其中一船速度快,相遇時(shí)距最近河岸720m;渡河后各停留10min后回返,再次相遇時(shí),距另一河岸400m.求:河寬.假設(shè):起初,A船從河A岸出發(fā),B船從河B岸出發(fā),A船速度V(A)大于B船速度V(B);且河岸寬L.解題過...
    我來回答
    類似推薦
    請使用1024x768 IE6.0或更高版本瀏覽器瀏覽本站點(diǎn),以保證最佳閱讀效果。本頁提供作業(yè)小助手,一起搜作業(yè)以及作業(yè)好幫手最新版!
    版權(quán)所有 CopyRight © 2012-2024 作業(yè)小助手 All Rights Reserved. 手機(jī)版