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Câu hỏi: Trong không gian Oxyz, mặt phẳng đi qua 3 điểm $A\left( 1;0;0 \right),\text{ B}\left( 0;2;0 \right),\text{ C}\left( 0;0;3 \right)$ có phương trình là:
A. $\dfrac{x}{1}+\dfrac{y}{2}+\dfrac{z}{3}=1$
B. $\dfrac{x}{1}+\dfrac{y}{2}+\dfrac{z}{3}=0$
C. $\dfrac{x}{1}+\dfrac{y}{2}+\dfrac{z}{3}=-1$
D. $\dfrac{x}{1}+\dfrac{y}{1}+\dfrac{z}{3}=1$
A. $\dfrac{x}{1}+\dfrac{y}{2}+\dfrac{z}{3}=1$
B. $\dfrac{x}{1}+\dfrac{y}{2}+\dfrac{z}{3}=0$
C. $\dfrac{x}{1}+\dfrac{y}{2}+\dfrac{z}{3}=-1$
D. $\dfrac{x}{1}+\dfrac{y}{1}+\dfrac{z}{3}=1$
Ta có: $\left( ABC \right):\dfrac{x}{1}+\dfrac{y}{2}+\dfrac{z}{3}=1$.
Đáp án A.