和提示答案一樣為什么報錯？
x1 = 1
d = 3
n = 100
x100 = d*（n-1）+x1
s = （x1+x100）*n/2
print s
File "index.py", line 4
SyntaxError: Non-ASCII character '\xef' in file index.py on line 4, but no encoding declared; see http://python.org/dev/peps/pep-0263/ for details
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2020-01-04
是因為你的括號是在中文條件下的，你換成英文條件下的括號，就OK啦～