如图，△A1B1C1是边长为1的等边三角形，A2为等边△A1B1C1的中心，连接A2B1并延长到点B2，使A2B1=B1B2，以A2B2为边作等边△A2B2C2，A3为等边△A2B2C2的中心，连接A

题干

如图，△A₁B₁C₁是边长为1的等边三角形，A₂为等边△A₁B₁C₁的中心，连接A₂B₁并延长到点B₂，使A₂B₁=B₁B₂，以A₂B₂为边作等边△A₂B₂C₂，A₃为等边

△A₂B₂C₂的中心，连接A₃B₂并延长到点B₃，使A₃B₂=B₂B₃，以A₃B₃为边作等边△A₃B₃C₃，依次作下去得到等边△A_nB_nC_n，则等边△A₅B₅C₅的边长为____．

上一题下一题 0.0难度选择题更新时间:2018-09-14 10:22:58

答案(点此获取答案解析）

16

9

同类题4

Mike is a middle school student. He goes to school from Monday to Friday. His home is about 5 miles from school. He usually walks to school. It takes him 30 minutes to walk there. Nancy's home is a little farther. It's 20 miles from school. So she often takes the school bus. It takes her 15 minutes to get to school. Bob lives outside the city. It's a town 30 miles away from his school. He takes the subway. It takes him 8 minutes to get to school by subway. He can have breakfast at home and then leave for the subway station. He studies very hard.

Name	How	How far	How long
Mike	He ____	It’s about 5 miles from school	____
____	She takes the school bus	It’s____ from school	15 minutes
Bob	He ____	It’s 30 miles from his school	20 minutes

题干

答案(点此获取答案解析）

同类题1

同类题2

同类题3

同类题4

同类题5