2 comments on “A Second Step to Mathematical Olympiad Problems vol 7

  1. កំណត់ប្រភេទត្រីកោណទាំងឡាយណាដែលមានក្រឡាផ្ទៃស្មើ1/4(a^2+b^2)ដែលa ,bជាពីរជ្រុងរបស់ត្រីកោណ។
    ជួយធ្វើអោយប្អូន១ផង!!

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