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通过定义计算 f(x) = 1/x 在 f'(1) 并写出 x = 1 处切线的方程。（答： f'(1) = -1 ；切线 。）
通过定义计算 f(x) = 1/x 在 f'(1) 并写出 x = 1 处切线的方程。（答： f'(1) = -1 ；切线 。）
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