Known rational numbers a>0, b>0, c>0, and abc=1, find ((a)/(ab+a+1))+((b)/(bc+b+1))+( The value of (c)/(ac+c+1)).
已知有理数a＞0，b＞0，c＞0，且abc=1，求((a)/(ab+a+1))+((b)/(bc+b+1))+((c)/(ac+c+1))的值．
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