有点急

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/02 15:22:44
有点急
xj@_%ddL>l}$iv76+W"""zSPhe|&{Ltc]@wɸfy0ّKwRI\4٨B7ٖ]^'s#DArH$BIWX>bhMivVU=3P7:D54!mA#8lݴ nSߠ:b4v­W§r/fŷLR1F4[7 =@ udӽiPJf7Bȫ^3) n cWdVųb,A6af||u2dr$[?[]oca{4+?ُdzE[5,SHāY&Iד/cTe tޢ gj#5#º F]Jm;-# 0³iE.`BY:/r

有点急
有点急
 

有点急
∵abc=1
  ∴ab+a+1=ab+a+abc=a(b+bc+1)
  ca+c+1=ca+c+abc=c(a+ab+1)
  ∴原式
  =(b+1)/(b+bc+1)+1/(a+ab+1)
  =a(b+1)/a(b+bc+1)+1/(a+ab+1)
  =a(b+1)/(ab+abc+a)+1/(a+ab+1)
  =a(b+1)/(ab+a+1)+1/(a+ab+1)
  =(ab+a+1)/(a+ab+1)
  =1

不好意思?我最烦的就是方程┏ (^ω^)=☞。帮不了你哈~

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

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