Chọn phương án đúng nhất: (left{ begin{array}{l} S in left( alpha right) cap left( beta right)\ a subset left( beta right)\ a//left( alpha right) end{array} right. Rightarrow left( alpha right) cap left( beta right) = dleft( {d,qua,S} right))

Câu hỏi:

Chọn phương án đúng nhất:

A.
\(\left\{ \begin{array}{l}
S \in \left( \alpha  \right) \cap \left( \beta  \right)\\
a \subset \left( \beta  \right)\\
a//\left( \alpha  \right)
\end{array} \right. \Rightarrow \left( \alpha  \right) \cap \left( \beta  \right) = d\left( {d\,qua\,S} \right)\)

B.
\(\left\{ \begin{array}{l}
S = \left( \alpha  \right) \cap \left( \beta  \right)\\
a \subset \left( \alpha  \right),b \subset \left( \beta  \right)\\
a//b
\end{array} \right. \Rightarrow \left( \alpha  \right) \cap \left( \beta  \right) = d\left( {d\,qua\,S} \right)\)

C.
\(\left\{ \begin{array}{l}
\left( \alpha  \right) \cap \left( \beta  \right) = a\\
a \cap d = I
\end{array} \right. \Rightarrow d \cap \left( \alpha  \right) = I\)

D.
\(\left\{ \begin{array}{l}
a \subset \left( \alpha  \right)\\
d \cap a = I
\end{array} \right. \Rightarrow d \cap \left( \alpha  \right) = I\)

Đáp án đúng: A