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Câu 13:

Trong không gian $Oxyz$

Câu 13: Trong không gian OxyzOxyzOxyz, một véctơ pháp tuyến của mặt phẳng (Oyz)\left( Oyz \right)(Oyz) là

Thông tin câu hỏi

Câu 13:

Trong không gian $Oxyz$ , một véctơ pháp tuyến của mặt phẳng $\left( Oyz \right)$ là