和提示答案一样为什么报错？
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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