題組內容
1. (50%) Answer the following questions.
(b) Find \( \lim_{x\to -\infty}\frac{5^x + 7^x}{2\cdot 5^x - 3\cdot 7^x} \).
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1. (50%) Answer the following questions.
(b) Find \( \lim_{x\to -\infty}\frac{5^x + 7^x}{2\cdot 5^x - 3\cdot 7^x} \).