Question

初二分式数学题，要详细过程，好的加分！急急急！！！

如此图：

Answer 1

∵ ab/(a+b)=1/3 ac/(a+c)=1/4 bc/(b+c)=1/5
∴ a+b/ab=3 a+c/ac=4 b+c/bc=5
(a+b)/ab + (a+c)/ac + (b+c)/bc =3+4+5=12
2(ab+ac+bc)/abc =12
ab+bc+ac/abc=6
abc/(ab+ac+bc) =1/6

Answer 2

∵ ab/(a+b)=1/3 ac/(a+c)=1/4 bc/(b+c)=1/5
∴ a+b/ab=3 a+c/ac=4 b+c/bc=5
(a+b)/ab + (a+c)/ac + (b+c)/bc =3+4+5=12
2(ab+ac+bc)/abc =12
ab+bc+ac/abc=6
abc/(ab+ac+bc) =1/6
就这些