| 这题据说比较难，打星号的。事后发现属于“灵机一动”。 |
| 送交者: 零加一中 2017年01月04日13:44:07 于 [灵机一动] 发送悄悄话 |
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∆ABC, ∠C = 90. AB = c, BC = a, CA = b. CL is an altitude on AB.Using CL as diameter to make a circle.The circle cuts CA at J and CB at K. JK = ? |
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| 实用资讯 | |
