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圈起來的那個式子怎麼來的

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因為f(x)÷(x-1)(x-2)=Q1(x)...(20x-10),帶1或2進去會餘20x-10,
所以f(x)÷(x-1)(x-2)(x-3)的餘式可以寫成(x-1)(x-2)的倍數+(20x-10),
這樣f(x)帶1或2進去也會是餘20x-10

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題目敘述:f(x)除以(x-1)(x-2)的餘式為20x-10

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