题目

通过构造恰当的图形,可以对线段长度、图形面积大小等进行比较,直观地得到一些不等关系或最值,这是“数形结合”思想的典型应用. (1) 【理解】如图1, ,垂足分别为C、D,E是 的中点,连接 .已知 , .①分别求线段 、 的长(用含a、b的代数式表示);②比较大小: ▲ (填“<”、“=”或“>”),并用含a、b的代数式表示该大小关系. (2) 【应用】如图2,在平面直角坐标系 中,点M、N在反比例函数 的图象上,横坐标分请根据句意,用括号内所给的单词的适当形式填空,每空词数不限。 1. I want                (have) a trip next month. 2. Which is                (fast), the bus or the car?3. I'm thirsty and let's                (drink) some water. 4. I see the boys                (play) basketball. 5. How many                (taxi) are there in front of the hotel? 6. Jim is an old                (drive)7. Mr. Smith is my                (three) math teacher. 8. Yesterday                (be) Saturday, March 15th. 9. They                (come) back home at 8:00 yesterday evening. 10. The boy walks                (slow) out of the big house.11. There                (be) a piece of bread on the plate. 12. Everyone                (have) a red apple.13. Li Ming                (fall) and               (break) his leg last month. 14. Thank you for                (ask) me. 15. Did you go                (shop) in Hong Kong?
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