September 2021 0 28 Report
На сто­ро­нах AB и AC тре­уголь­ни­ка ABC взяты со­от­вет­ствен­но точки D и E так, что число AD:AB=1:2,AE:AC=1:2. Найти длину от­рез­ка DE, если BC=12 см.​
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