a) Tìm \(x \) biết: \(4x + 2 = 0 \)
b) Rút gọn: \(A = \left( { \sqrt 5 - 3} \right) \left( { \sqrt 5 + 3} \right) + 6 \)
A.\(\begin{array}{l}{\rm{a)}}\,\,x = \frac{1}{2}\\{\rm{b)}}\,\,A = 1\end{array}\)
B.\(\begin{array}{l}{\rm{a)}}\,\,x = - \frac{1}{2}\\{\rm{b)}}\,\,A = - 2\end{array}\)
C.\(\begin{array}{l}{\rm{a)}}\,\,x = - \frac{1}{2}\\{\rm{b)}}\,\,A = 2\end{array}\)
D.\(\begin{array}{l}{\rm{a)}}\,\,x = \frac{1}{2}\\{\rm{b)}}\,\,A = - 1\end{array}\)
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Hóa Học lớp 12
