设abc=1.则a/ab+a+1 + b/bc+b+1 +c/ca+c+1=?要具体的过程,
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设abc=1.则a/ab+a+1 + b/bc+b+1 +c/ca+c+1=?要具体的过程,
设abc=1.则a/ab+a+1 + b/bc+b+1 +c/ca+c+1=?要具体的过程,
设abc=1.则a/ab+a+1 + b/bc+b+1 +c/ca+c+1=?要具体的过程,
a/ab+a+1 + b/bc+b+1 +c/ca+c+1
=a/(ab+a+abc)+b/(bc+b+1)+bc/(cba+bc+b)
=1/(b+bc+1)+b/(bc+b+1)+bc/(a+bc+b)
=(1+b+bc)/(b+bc+1)
=1