便利超市店庆期间优惠促销，橙汁每箱36元，每箱有24瓶，若买15箱需要多少钱？
解：36×15=540(元)
如图，△ABC与△DCE都是等腰直角三角形，其中AC=BC，CD=CE，∠ACB=∠DCE =90°,点D在AB上，求证：AB⊥BE
Not only my friends but also I __________ interested in football and Messi is our favorite star.
