※ 引述《NSJ911005 (Sheng-Jie Ni)》之铭言：
: 试求(x-a)(x-b)(x-c)……(x-z)=?
: Ans:0
: 因为中间有一项为(x-x)
python 2.7.10:
(x-a)(x-b)(x-c)……(x-z)=?
^
SyntaxError: invalid syntax
mathematica 10.3:
(x-a)(x-b)(x-c)\[Ellipsis]\[Ellipsis] (x-z)=" is incomplete; more \
input is needed.