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用複合函數求導法則得 f(x)=x(x_1)(x_2)…(x_99)(x_100) f'(x)=(x_1)(x_2)…(x_99)(x_100)+x(x_2)…(x_99)(x_100)+x(x_1)…(x_99)(x_100)+…+x(x_1)(x_2)…(x_99) 所以f'(0)=100!
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