问题
解答题
用简便的方法计算：
（1）1999×2001（2）1982．
答案
（1）原式=（2000-1）×（2000+1）
=20002-1
=4000000-1
=399999；
（2）原式=（200-2）2
=2002-800+4
=40000-800+4
=39204．
搜题请搜索小程序“爱下问搜题”
用简便的方法计算：
（1）1999×2001（2）1982．
（1）原式=（2000-1）×（2000+1）
=20002-1
=4000000-1
=399999；
（2）原式=（200-2）2
=2002-800+4
=40000-800+4
=39204．
VII. 写作（Writing）（共2小题，计２5分） A) Read the following passage, and then use your own words to give a brief summary of it in about 90 words.（10分）（答案写在答题纸上） All thanks to the mobile phone
The weather was too bad for any rescue attempt to be made. Dave waited for three days, hoping that conditions would improve. But the rescue planes could not land because dense fog prevented them from seeing the surface of the ice. It was a race against time. Then he remembered his mobile phone. He marked out a runway on the ice and took a photograph with his digital camera. Then he used his phone to e-mail it to the waiting air rescue team. Using the photograph to guide him, the pilot was able to land in spite of the weather, and Dave was lifted off the ice to safety. |
