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几何构造，通过60度构造等边我们都知道，但是着实不好想
八年级解题方法与技巧66/81
App11:07
App09:07
App09:32
App02:38
App03:00
App09:59
App04:12
App10:04
App04:41
App05:11
App08:16
App03:57
App05:40
App04:54
App01:18
App09:56
App01:54打开App观看
App11:07App09:07App09:32App02:38App03:00App09:59App04:12App10:04App04:41App05:11App08:16App03:57App05:40App04:54App01:18App09:56App01:54
