P(x)又可表示为 (x-c)(xx+ex+d) , 比较原来的P(x), 得出cd=13, c 只能是-1,1,-13,13,然后一个个试,令x=c,比较P(x)的两个不同表式,可得出a和b.
P(x)又可表示为 (x-c)(xx+ex+d) , 比较原来的P(x), 得出cd=13, c 只能是-1,1,-13,13,然后一个个试,令x=c,比较P(x)的两个不同表式,可得出a和b.
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