Find the first three terms in the expansion ofa) (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

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Find the first three terms in the expansion ofa) (x-1)*(-2) b) (x-1)*(1/2)补充:
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Find the first three terms in the expansion ofa) (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
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

Find the first three terms in the expansion ofa) (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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a)1/(x-1)^2
b)根号(x-1)
不会找。

(x-1)*3 ?

什么扩展?
扩展成X的多项式?
那就用泰勒公式好了,将其展开成泰勒级数然后取前三项就OK了.
a) 式子的前三项是1+2x+6x^2 (取x0等于0时带入公式)
b) 式子的前三项是(1/2)+(3/2)x-(1/4)x^2 (取x0等于2时带入公式)

a) (x-1)*(-2)
=-2x+2
b) (x-1)*(1/2)
=根号下(x-1)
都是只有两项啊,都没有第三项啊

因为不是多项式,不可能有扩展后的前三项!

英文的呀

迈克劳林级数???
天文啊
买糕的

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