已知a:b:c=2:3:4,且a(x+y)=b(y+z)=c(x+z)則x:y:z=?

2017-08-12 2:21 pm

回答 (1)

2017-08-13 12:17 pm
✔ 最佳答案
Sol
加上xyz<>0
a:b:c=2:3:4
a/2=b/3=c/4=p
a=2p,b=3p,c=4p
a(x+y)=b(y+z)=c(x+z)
2p(x+y)=3p(y+z)=4p(z+z)=12pw
x+y=6w,y+z=4w,x+z=3w
2(x+y+z)=13w
x+y+z=6.5w
x=2.5w,y=3.5w,z=0.5w
xyz<>0
w<>0
x:y:z=2.5w:3.5w:0.5W=5:7:1


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