高等数学问题
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X趋近于0时,(1-x)的k次方-1等价于kx.这是等价无穷小替换常用公式。回到你的问题:X~0时,f(x) 也要趋于0才有{[根号1-f(x)] -1}等价于1/2f(x)。中间不能用等号,除非前面有极限符号,即:lim{[根号1-f(x)] -1}=lim1/2f(x)。你的意思是对的,说法不对
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