Mathematics, 24.07.2021 01:00 toddb4955
Cho hbh ABCD ,O lµ giao ®iÓm 2 ®-êng chÐo AC vµ BD . Gäi M, N lÇn l-ît lµ trung ®iÓm cña OB ,OD a) CM : Tg AMCN lµ hbh b) AM c¾t BC ë E , CN c¾t AD ë F , C/m : AC, BD, E F ®ång quy
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28 x 12 + 34 = ? it's for a test that if i fail on i will not proceed into the honor roll society i always dreamed of!me! worth 50 !
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Cho hbh ABCD ,O lµ giao ®iÓm 2 ®-êng chÐo AC vµ BD . Gäi M, N lÇn l-ît lµ trung ®iÓm cña OB ,OD a) C...
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