发布网友 发布时间:2024-10-22 20:32
共3个回答
热心网友 时间:2024-11-14 08:14
a/(ab+a+1)=ac/(abc+ac+c)=ac/(ac+c+1)
b/(bc+b+1)=abc/(abc²+abc+ac)=1/(c+1+ac)
a/(ab+a+1)+b/(bc+b+1)+c/(ac+c+1)
=ac/(ac+c+1)+1/(ac+c+1)+c/(ac+c+1)
=(ac+c+1)/(ac+c+1)
=1
热心网友 时间:2024-11-14 08:07
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热心网友 时间:2024-11-14 08:15
因为abc=1.
a/(ab+a+1)+b/(bc+b+1)+c/(ac+c+1)
=a/(ab+a+1)+ab/(abc+ab+a)+abc/(abac+abc+ab)
=a/(ab+a+1)+ab/(1+ab+a)+1/(a+1+ab)
=(ab+a+1)/(ab+a+1)
=1