Find the first three terms in the expansion of

来源：学生作业帮编辑：作业帮分类：数学作业时间：2024/05/25 06:06:09

Find the first three terms in the expansion of
a) (x-1)*(-2) b) (x-1)*(1/2)
补充："*"是“次方”
中文的意思应该是：找出扩展后的前三项

a) （1-x）^(-2)=（1+ -x）^(-2) 由迈克劳林级数展开前三项
=1-x/2+3x^2
b）（x-1）^(1/2)=（1+(x-2)）^(1/2) 由迈克劳林级数展开前三项
=1+（x-2）/2-(x-2)^2/8
迈克劳林级数 (1+x)^a=1+ax+a*(a-1)*x^2/2!+……+[a*(a-1)……(a-n+1)*x^n/n!]+……

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