当x→0时,ex一为x的3阶无穷小,则a=_______,b=________.

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问题 当x→0时,ex为x的3阶无穷小,则a=_______,b=________.

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答案[*]

解析 由ex=1+x++ο(x3),
=1一bx+b2x2一b3x3+ο(x)3,得
=(1+ax)[1一bx+b2x2一b3x3+ο(x3)]
=1+(a一b)x+(b2一ab)x2+(ab2一b3)x3+ο(x3),
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