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- 1It is said that___umbrella was invented over four thousand years ago by chinese people
- 2在RT三角形ABC中,角C=90度,BC=5,圆O内切于三角形ABC,切点分别为D,E,F若圆O的半径为2,求三角形ABC的周
- 3若x2+y2=12,xy=4,则x-y=_.
- 4一个正方体,切一刀,截面可能是哪些图形?最好有图片,只切一刀.
- 5前几天做了个数字推理题:1,7,7,9,17,43,()括号里应该填什么数呀?为什么?不好意思选项忘记了
- 6已知二次函数图像顶点坐标为(1,3),且过点(2,5),求此二次函数的解析式.
- 7在△ABC中,已知2cos(B+C)=1,b+c=3根号3,bc=4求:(1)角A的度数 (2)边BC的长度 (3)△ABC的面积
- 8We found that she was very friendly.(同义句)We____ ____ very friendly.
- 9某小学的校园长300米,画在平面图上是30厘米,量得校园的宽式150米,在这张平面图上应画几厘米?
- 10如图,正方形ABCD的边长为1cm,E、F分别是BC、CD的中点,连接BF、DE,则图中阴影部分面积是( )cm2. A.45 B.23 C.56 D.34