Question

第14题怎么做？

Answer 1

a/(ab+a+1)=a/(ab+a+abc)=1/(b+1+bc)

c/(ac+c+1)=bc/(abc+bc+b)=bc/(1+bc+b)

所以，a/(ab+a+1)+b/(bc+b+1)+c/(ac+c+1)=1/(bc+b+1)+b/(bc+b+1)+bc/(bc+b+1)=1

追答

望采纳

拒绝刷题

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谢谢

追答

😊

Answer 2

图

追问

为什么

怎么变得

Answer 3

a/(ab+a+1) + b/(bc+b+1) + c/(ca+c+1)
=a/(ab+a+1) + ab/(abc+ab+a) + bc/(abc+bc+b)
=a/(ab+a+1) + ab/(ab+a+1) + bc/(bc+b+1)
=a/(ab+a+1) + ab/(ab+a+1) + abc/(ab+a+1)
=(a+ab+abc)/(ab+a+1)
=1