Mathematics, 16.10.2021 23:20 aevans3503

Cho hình bình hành ABCD tâm O . CMR: a) AO+ BO +CO +DO = 0. b) AB +CA =DA .c) AO+ BO =BC . d) AO- BO= DC . e) AO- BO =CD .

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Cho hình bình hành ABCD tâm O . CMR: a) AO+ BO +CO +DO = 0. b) AB +CA =DA .c) AO+ BO =BC . d) AO- BO...

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