主要内容

积分学

课程 14: 作为几何级数的功能

作为几何级数的功能

f, left parenthesis, x, right parenthesis, equals, start fraction, 3, divided by, 1, minus, x, squared, end fraction

找出f的幂级数

(选择 A)
3, plus, 3, x, plus, start text, space, end text, dots, plus, start text, space, end text, 3, x, start superscript, n, end superscript, plus, dots
(选择 B)
3, x, plus, 3, x, squared, plus, point, point, point, plus, 3, x, start superscript, n, plus, 1, end superscript, plus, dots
(选择 C)
3, start text, space, end text, plus, start text, space, end text, 3, x, squared, dots, plus, start text, space, end text, 3, x, start superscript, 2, n, end superscript, plus, dots
(选择 D)
3, start text, space, end text, plus, start text, space, end text, 9, x, squared, plus, dots, plus, start text, space, end text, left parenthesis, 3, x, squared, right parenthesis, start superscript, n, end superscript, plus, dots

不会做了？