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Mathematics, 16.06.2021 16:10 tannerroland

Câu 45: Trong các mệnh đề sau, mệnh đề nào đúng? A. Hai đường thẳng phân biệt vuông góc với nhau thì chúng cắt nhau. B. Hai đường thẳng phân biệt cùng vuông góc với đường thẳng thứ ba thì vuông góc C. Cho hai đường thẳng song song, đường thẳng nào vuông góc với đường thẳng thứ nhất thì cũng vuông góc với đường thẳng thứ hai. D. Trong không gian, hai đường thẳng phân biệt cùng vuông góc với đường thẳng thứ ba thì song song với nhau.

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Câu 45: Trong các mệnh đề sau, mệnh đề nào đúng? A. Hai đường thẳng phân biệt vuông góc với nhau thì...
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