Cho tứ diện ABCD. CMR: $(AB+DC)^{2}+(AD+BC)^{2}> (AC+BD)^{2}$
CMR: $(AB+DC)^{2}+(AD+BC)^{2}> (AC+BD)^{2}$
Started By Math Hero, 13-02-2016 - 19:47
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Posted 13-02-2016 - 19:47
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