x100 = x1 +（n - 1) * d为什么不对？
x1 = 1
d = 3
n = 100
x100 = x1 +（n - 1) * d
print x100
s = n*(x1 + x100)/2
print s
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x1 = 1
d = 3
n = 100
x100 = x1 +（n - 1) * d
print x100
s = n*(x1 + x100)/2
print s
2015-06-04
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