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高等数学函数？
高等数学函数？
2024-11-08 17:50:45
推荐回答（2个）
回答1：
这是利用等价无穷小替换的。
也可用平方差公式分子有理化。约去分母x，=1/2
回答2：
直接等价无穷小变换
根号（1+x）-1等价无穷小是1/2x
其实（1+x）^a-1等价无穷小为ax
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