Mathematics, 30.07.2021 04:10 KillerSteamcar

Cho góc xOy, đường thẳng a vuông góc với Ox, đường thẳng b vuông góc với Oy. Hỏi a và b có cắt nhau không? Tại sao?

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Cho góc xOy, đường thẳng a vuông góc với Ox, đường thẳng b vuông góc với Oy. Hỏi a và b có cắt nhau...