李小虎的妈妈到商店为食堂买炊具，平锅每个108元，高压锅每个298元，微波炉每个312元，每样买3个，她带2500元够吗

Li Xiao hu spent too much time playing computer games and fell behind others.Being his friend, I told him that it was bad to spend too much time on computer games and we should study hard. I also gave him some interesting books to let him read books instead of playing computer games. I helped him with his lessons after school. With my help and his hardwork, he made great progress in his study. Now he catch up with his classmates and he also become interested in his lessons.

∠B+∠D=∠BED,过E点画一条线与AB,CD平行内错角相等,这只是我的想法,不知道对不对,最好发张图

One possible version Li Xiaohu spent too much time playing computer games and he fell behind others. As a good/close friend of his, I must do something to help him. First, I must tell him that playing computer games too much is bad for his health, especially for his eyes. So he must give it up. I can play more sports with him after school. Maybe he will become more interested in sports than computer games. And then I'll ask him to concentrate more on his study. Of course, I will try my best to help him with all his subjects. I think I can do it in many fun ways and let him find much fun in studying. At the same time, I'll ask both his parents and our teachers to help him, too. If I try these, I'm sure he will make great progress soon.

图一：∠B+∠D=∠BED
图二：∠B+∠D=360-∠BED
图三：∠D-∠B=∠BED
图四：∠B-∠D=∠BED
理由：AB、CD平行

（1）①∠B+∠D=∠BED；
②∠B+∠D+∠BED=360°；
③∠BED=∠D-∠B；
④∠BED=∠B-∠D；

（2）选图③．
过点E作EF ∥ AB，∵AB ∥ CD，
∴EF ∥ CD，
∴∠D=∠DEF，∠B=∠BEF，
又∵∠BED=∠DEF-∠BEF，
∴∠BED=∠D-∠B．

∠BED=∠B+∠D
过E向B、D方向作EF//AB,则EF//CD
则 ∠BEF=∠B,∠DEF=∠C
所以,∠BED=∠BEF+∠DEF=∠B+∠D