a/(ab+a+1) + b/(bc+b+1) + c/(ca+c+1)
=1/(b+1+1/a) + b/(bc+b+1) + bc/(cab+cb+b)
=1/(b+1+bc) + b/(bc+b+1) + bc/(1+bc+b)
=(b+1+bc)/(b+1+bc)
=1
已知abc=1 求证a/(ab+a+1) + b/(bc+b+1) + c/(ca+c+1)=1
已知abc=1 求证a/(ab+a+1) + b/(bc+b+1) + c/(ca+c+1)=1
数学人气:862 ℃时间:2019-12-13 18:03:29
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