[Toán 8]bdt tam giác

V

vip112233

Qua don gian ban oi ,.;'//
trong 1tam giac tong do dai hai canh bao gioi cung lon hon do dai canh con lai goi O la Giao diem hai duong cheo ta co:
OA+OD>AD ; OB+OC>BC \RightarrowAC+BD>AD+BC
ma AC=AD\RightarrowBD>BC (dpcm)



HOC HOC NUA HOC MAI
 
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