p(x)为二次三项式,要使得ex=p(x)+o(x2)(x→0),则p(x)=_________.

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问题 p(x)为二次三项式,要使得ex=p(x)+o(x2)(x→0),则p(x)=_________.

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答案[*]

解析 设p(x)=ax2+bx+c,由题意知,当x→0时,ex一p(x)=o(x2),由于ex=1+x++o(x2)于是ex-p(x)=(1-c)+(1-b)x++o(x2)故有1一c=0,1一b=0,b=1.c=1.
    于是
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