x1 = 1
d = 3
n = 100
x100 = x1+(n-1)*d
s = (x1+x100)*n/2
print s
隐市弥勒
2014-10-30
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x1 = 1
d = 3
n = 100
x100 = x1+(n-1)*d
s = (x1+x100)*n/2
print s
2014-10-30
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