請問下，下面的語句是否正確，為什么沒有輸出呢
sum = 0
x = 1
while x < 51:
??? sum = sum + (2*x-1)
print sum
zhusilun
2016-08-21
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2016-08-21
sum = 0
x = 1
while x < 51:
??? sum = sum + (2*x-1)
print sum
少了x+1
2016-08-21
sum = 0
x = 1
while x < 51:
??? sum = sum + (2*x-1)
? ? x = x + 1
print sum
2016-08-21
x一直都是1，所以一直執行語句