问题
解答题
三角形中两个锐角和小于第三个内角，这个三角形是______三角形．
答案
根据题意，设这三个内角为a，b，c，则a+b+c=180°且a+b＜c，
假设a+b=c，则a+b=c=90度，
因为a+b＜c，且a+b+c=180°，所以只有当c大于90度的时候，a+b才会小于c，
所以c是钝角，该三角形是钝角三角形；
故答案为：钝角．
搜题请搜索小程序“爱下问搜题”
三角形中两个锐角和小于第三个内角，这个三角形是______三角形．
根据题意，设这三个内角为a，b，c，则a+b+c=180°且a+b＜c，
假设a+b=c，则a+b=c=90度，
因为a+b＜c，且a+b+c=180°，所以只有当c大于90度的时候，a+b才会小于c，
所以c是钝角，该三角形是钝角三角形；
故答案为：钝角．
第三部分：阅读理解（共20小题，每小题2分，共40分）。 Live Music—Late Night Jazz Enjoy real American jazz from Herbie Davis, the famous trumpet player. He is known to play well into the early hours, so don’t want to get much sleep.
Scottish dancing is nice and easy to learn. The wonderful dance from England will be given.
Shows – Anhui Museum There are 12, 000 pieces on the show here. You can see the whole of Chinese history.
Your pen friend is coming from Australia to your city for a holiday. You send him this E-mail to tell his something about the hotels.
1. If you want to watch dancing, you can call _____ . A. 4668736 B. 4021877 C. 4886888 D. 4686788 2. You can see the whole of Chinese history at _____ in April in Anhui Museum. A. 3 p.m. every day B. 9 p.m. from Monday to Friday C. 7 a.m. at the weekends D. 7 p.m. every day 3. You can enjoy _____ at Jack Stein’s. A. American Jazz B. Scottish C. 12,000 pieces on show D. yourself all night 4. Sun Hotel and Rose Hotel are open for _____ months of the year. A. nine B. ten C. eleven D. twelve |