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【简答题】
已知:△ABC是任意三角形. (1)如图1所示,点M、P、N分别是边AB、BC、CA的中点,求证:∠MPN=∠A. (2)如图2所示,点M、N分别在边AB、AC上,且 AM AB = 1 3 , AN AC = 1 3 ,点P 1 、P 2 是边BC的三等分点,你认为∠MP 1 N+∠MP 2 N=∠A是否正确?请说明你的理由. (3)如图3所示,点M、N分别在边AB、AC上,且 AM AB = 1 2010 , AN AC = 1 2010 ,点P 1 、P 2 、…、P 2009 是边BC的2010等分点,则∠MP 1 N+∠MP 2 N+…+∠MP 2009 N=______. (请直接将该小问的答案写在横线上)
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参考答案:
举一反三
【单选题】Part A Directions: You will hear a talk. As you listen, answer Questions 1-10 by circling TRUE or FALSE. You will hear the talk ONLY ONCE. You now have 1 minute to read Questions 1-10. 听力原文: When you ...
A.
Right
B.
Wrong
【判断题】Listen again and answer True (T) or False (F). Paul's relationship with the soldiers was close when he arrived in theatre.
A.
正确
B.
错误
【判断题】在C51中只要执行语句EA=1,就能使CPU响应中断
A.
正确
B.
错误
【单选题】微型计算机的CPU由( )组成。
A.
ALU和RAM
B.
控制器和内存储器
C.
运算器和内存储器
D.
运算器和控制器
【单选题】Part A Directions: You will hear a talk. As you listen, answer Questions 1-10 by circling TRUE or FALSE. You will hear the talk ONLY ONCE. You now have 1 minute to read Questions 1-10. 听力原文: From good...
A.
True
B.
Fasle
【单选题】Part A Directions: You will hear a talk. As you listen, answer Questions 1-10 by circling TRUE or FALSE. You will hear the talk ONLY ONCE. You now have 1 minute to read Questions 1-10. 听力原文: From good...
A.
Right
B.
Wrong
【单选题】单季晚稻叶色诊断指标“”第一黄”出现在( )时期。
A.
分蘖盛期
B.
分蘖末期
C.
拔节前
D.
稻穗开始分化前
【单选题】Part A Directions: You will hear a talk. As you listen, answer Questions 1-10 by circling TRUE or FALSE. You will hear the talk ONLY ONCE. You now have 1 minute to read Questions 1-10. 听力原文: When you ...
A.
True
B.
Fasle
【单选题】Listen and choose the correct answer for each question.
A.
Jeans and a T-shirt.
B.
At the shopping mall.
C.
I prefer to window-shop.
【判断题】健康猪的呼吸频率为8-6次/分。
A.
正确
B.
错误
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