Khẳng định nào sau đây Sai ?
A.\({x^2} \ge 3x\)\( \Leftrightarrow \left[ \begin{array}{l}x \ge 3\\x \le 0\end{array} \right.\).
B.\(\frac{{x - 3}}{{\left| {x - 4} \right|}} \ge 0\)\( \Leftrightarrow x - 3 \ge 0\).
C.\(x + \left| x \right| \ge 0 \Leftrightarrow x \in \mathbb{R}.\)
D.\({x^2} < 1\)\( \Leftrightarrow \left| x \right| < 1\).
A.\({x^2} \ge 3x\)\( \Leftrightarrow \left[ \begin{array}{l}x \ge 3\\x \le 0\end{array} \right.\).
B.\(\frac{{x - 3}}{{\left| {x - 4} \right|}} \ge 0\)\( \Leftrightarrow x - 3 \ge 0\).
C.\(x + \left| x \right| \ge 0 \Leftrightarrow x \in \mathbb{R}.\)
D.\({x^2} < 1\)\( \Leftrightarrow \left| x \right| < 1\).
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Hóa Học lớp 12
