已知y+z分之x =a ,x+z分之y =b ,x+y分之z =c,试求a+1分之a + b+1分之b + c+1分之c 的值

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已知y+z分之x=a,x+z分之y=b,x+y分之z=c,试求a+1分之a+b+1分之b+c+1分之c的值已知y+z分之x=a,x+z分之y=b,x+y分之z=c,试求a+1分之a+b+1分之b+c+

已知y+z分之x =a ,x+z分之y =b ,x+y分之z =c,试求a+1分之a + b+1分之b + c+1分之c 的值
已知y+z分之x =a ,x+z分之y =b ,x+y分之z =c,试求a+1分之a + b+1分之b + c+1分之c 的值

已知y+z分之x =a ,x+z分之y =b ,x+y分之z =c,试求a+1分之a + b+1分之b + c+1分之c 的值
因为:
a/(a+1)=[x/(y+z)]/[(x+y+z)/(y+z)]=x/(x+y+z)
b/(b+1)=[y/(x+z)]/[(x+y+z)/(x+z)]=y/(x+y+z)
c/(c+1)=[z/(x+y)]/[(x+y+z)/(x+y)]=z/(x+y+z)
所以
a/(a+1)+b/(b+1)+c/(c+1)=x/(x+y+z)+y/(x+y+z)+z/(x+y+z)=(x+y+z)/(x+y+z)=1

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