Gọi M là trung điểm của đoạn thẳng AB .Trên tia đối của BA lấy O(O khác B) .So sánh OM với trung bình của 2 đoạn thẳng OA và OB
Giải ra cho mk nhé
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1 tháng 1 2020
Ta có:
2OM=OM+OM=(OA+AM)+(OB−BM)=OA+OB+(AM−BM)2OM=OM+OM=(OA+AM)+(OB−BM)=OA+OB+(AM−BM)
Vì M là trung điểm AB
=> AM=BM
=> 2OM=OA+OB2OM=OA+OB
=> OM=OA+OB2
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