题目内容

已知a="1,2,3,4,5",b=a.split(","),c=list(map(int,b)，则"+".join(b)+"="+str(sum(c))的值为（）。

A. '1+2+3+4+5=15'
B. '1,2,3,4,5=15'
C. '1+2+3+4+5'
D. 以上均不是

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