皮皮学,免费搜题
登录
logo - 刷刷题
搜题
【简答题】
在图①至图③中,已知△ABC的面积为 . (1)如图①,延长△ABC的边BC到点D,使CD=BC,连结DA。若△ACD的面积为S 1 ,则S 1 =______(用含 的代数式表示); (2)如图②,延长△ABC的边BC到点D,延长边CA到点E,使CD=BC,AE=CA,连结DE.若△DEC的面积为S 2 ,则S 2 =__________(用含 的代数式表示); (3)在图①—②的基础上延长AB到点F,使BF=AB,连结FD,FE,得到△DEF(如图③). 阴影部分的面积为S 3 ,则S 3 =__________(用含 的代数式表示),并运用上述(2)的结论写出理由. 理由:
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
微信内点击右上角“…”即可分享
反馈
参考答案:
举一反三
【单选题】17 Could you tell me ____ in your home town in winter? A. if it often snowed B. whether does it often snow C. if it often snow D. whether it often snows
A.
选择1
B.
选择2
C.
选择3
D.
选择4
【单选题】it is going to snow.
A.
It looks that
B.
It seemed as if
C.
It's seemed that
D.
It looks as if
【单选题】Who is more serious?
A.
Tom.
B.
Bob
C.
Bob’s brother
【单选题】_______ does it snow so heavily in South China as it did in the winter of 2007. [     ]
A.
Usually
B.
Frequently
C.
Rarely
D.
Regularly
【单选题】When might it snow?
A.
This evening.
B.
Tomorrow morning.
C.
Tomorrow evening.
D.
This weekend.
【单选题】_______ it snow , the crops would grow better .
A.
Ought
B.
Would
C.
Might
D.
Should
【单选题】It costs 30 Euros to visit the aquarium in Valencia. You have to............... 30 Euros to visit the aquarium in Valencia.
A.
cost
B.
take
C.
pay
D.
worth
【简答题】选用方框中所给的句子补全对话,(有一项为多余)。 A. How are you? B. Does it snow there? C. It's very cold and quite windy. D. How cold it is! E. So it's nice and warm. F. What's the weather like in Sydney, Dad? Mr. White: He...
【单选题】( )资源中心是用来访问和维护资源中心库的工具。用资源中心进行哪种操作不正确?
A.
查找资源中心库中的零件
B.
在部件中插入资源中心库零件
C.
不能发布资源中心库中的零件、IParts或特征
D.
编辑放置在部件中的资源中心库零件
【多选题】资源中心是用来访问和维护资源中心库的工具。您可以用资源中心进行如下操作()。
A.
查找资源中心库中的零件
B.
在部件中插入资源中心库零件
C.
更改资源中心库零件的参数
D.
编辑放置在部件中的资源中心库零件
相关题目:
参考解析:
知识点:
题目纠错 0
发布
创建自己的小题库 - 刷刷题