Giả sử lim x → x 0 f ( x ) = L . Trong các khẳng định sau, khẳng định nào sai ?

\(\mathop {\lim }\limits_{x \to {x_0}} \left| {f\left( x \right)} \right| = \left| L \right|.\)

\(\mathop {\lim }\limits_{x \to {x_0}} \sqrt[3]{{f\left( x \right)}} = \sqrt[3]{L}.\)

\(\mathop {\lim }\limits_{x \to {x_0}} \sqrt {f\left( x \right)} = \sqrt L .\)

\(\mathop {\lim }\limits_{x \to {x_0}} \left[ { - f\left( x \right)} \right] = - L.\)