History, 31.10.2021 01:00 rero

cho tam giác ABC vuông tại A. D là điểm bất kì thuộc cạnh BC. Kẻ DE, DF lần lượt vuông góc với AB, AC ( E thuộc AB, F thuộc AC). a) Chứng minh AD = EF. b) Xác định vị trí của D để EF có độ dài nhỏ nhất

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cho tam giác ABC vuông tại A. D là điểm bất kì thuộc cạnh BC. Kẻ DE, DF lần lượt vuông góc với AB, A...

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