Tìm các giới hạn sau:
a) \(\mathop {\lim }\limits_{x \to - 3} \left( {8 + 3x - {x^2}} \right)\);
b) \(\mathop {\lim }\limits_{x \to 2} \left[ {\left( {5x - 1} \right)\left( {2 - 4x} \right)} \right]\);
c) \(\mathop {\lim }\limits_{x \to - 2} \frac{{{x^2} - x}}{{{{\left( {2x + 1} \right)}^2}}}\);
d) \(\mathop {\lim }\limits_{x \to - 1} \sqrt {10 - 2{x^2}} \).
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