题解 | #牛牛的并联电路#
牛牛的等差数列
http://www.nowcoder.com/practice/fb9daba67b88437a9e501adf020d425e
a,b=map(int,input().split(' ')) # 确定a和b
gap=b-a # 差值
print(b+gap)
牛牛的等差数列
http://www.nowcoder.com/practice/fb9daba67b88437a9e501adf020d425e
a,b=map(int,input().split(' ')) # 确定a和b
gap=b-a # 差值
print(b+gap)
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