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x->1
f(x) = 1- x^(1/3) => f(1) =0
f'(x) = -(1/3)x^(-2/3) => f'(1)/1! = -1/3
1- x^(1/尘厅3) = -(1/3)(x-1) +o(x-1)
g(x) = 1-x
1- x^(1/绝兄空并瞎3) 与 1-x 是同价无穷小 (不是等价)
f(x) = 1- x^(1/3) => f(1) =0
f'(x) = -(1/3)x^(-2/3) => f'(1)/1! = -1/3
1- x^(1/尘厅3) = -(1/3)(x-1) +o(x-1)
g(x) = 1-x
1- x^(1/绝兄空并瞎3) 与 1-x 是同价无穷小 (不是等价)
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