问题标题:
f(x)除以(x-1)(x-2),余式为(2x+5),f(3)=5,求f(x)除以(x-1)(x-3)的余式
问题描述:

f(x)除以(x-1)(x-2),余式为(2x+5),f(3)=5,求f(x)除以(x-1)(x-3)的余式

柳亚明回答:
  C(x)是多项式   f(x)=C(x)*(x-1)(x-2)+2x+5   C(3)=5   f(x)/[(x-1)(x-3)]=C(x)*(x-2)/(x-3)+(2x+5)/[(x-1)(x-3)]   =C(x)*(x-2)/(x-3)+(2x-2+7)/[(x-1)(x-3)]   =[C(x)*(x-2)+2]/(x-3)+7/[(x-1)(x-3)]   因为x=3有意义   ==>[C(x)*(x-2)+2]/(x-3)是多项式(能除净)   f(x)除以(x-1)(x-3)的余式是7
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