Câu hỏi 88
Nếu
$$
\left\{\begin{array}{l}
w x y=10 \\
w y z=5 \\
w x z=45 \\
x y z=12
\end{array}\right.
$$
thì $w + y$ bằng bao nhiêu?
$$
\left\{\begin{array}{l}
w x y=10 \\
w y z=5 \\
w x z=45 \\
x y z=12
\end{array}\right.
$$
thì $w + y$ bằng bao nhiêu?