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tieuthu_bongbong
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
hai be nuoc hinh hop chu nhat co chieu dai , chieu rong tuong ung bang nhau.Chieu cao be 1 = 2/3 chieu cao be 2 . De bom day nuoc vao be 1 phai mat 6 gio . Hoi phai mat bao nhieu thoi gian de bom day nuoc vao be 2 , biet rang cong xuat may nhu nhau.