A:①②③
B:②③④
C:①②④
D:①③④
将实数5,π,0,﹣6由小到大用“<”号连起来,可表示为____
如图,在△ABC中,AB=AC,⊙O是△ABC的内切圆,它与AB,BC,CA分别相切于点D、E、F.
(1)求证:BE=CE;
(2)若∠A=90°,AB=AC=2,求⊙O的半径.
从方框中选词并用其适当形式填空
(1)My pen pal ____ a brother and a sister. (2)Larry ____ math because she thinks it’s difficult. (3)The Greens ____ from the USA. (4)Please write and ____ me about your country. (5)This is a ____ robot(机器人). It can do a lot of things.