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How to do the triangle in the eighth math problem should be detailed! ! !
Proof: extend AO to BC to D.

∫AC+CD > AD,BD+OD>OB

∴AC+CD+BD+OD>AD+OB

∫CD+BD = BC,AD=OA+OD

∴AC+BC+OD>OA+OD+OB

∴AC+BC>OA+OB

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