已知x:y=3:5,y:z=2:3,求x+y+z/2x-y+z的值.

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已知x:y=3:5,y:z=2:3,求x+y+z/2x-y+z的值.已知x:y=3:5,y:z=2:3,求x+y+z/2x-y+z的值.已知x:y=3:5,y:z=2:3,求x+y+z/2x-y+z的

已知x:y=3:5,y:z=2:3,求x+y+z/2x-y+z的值.
已知x:y=3:5,y:z=2:3,求x+y+z/2x-y+z的值.

已知x:y=3:5,y:z=2:3,求x+y+z/2x-y+z的值.
因为x:y=3:5 , y:z=2:3 ,
设 x= 6k ,则 y = 10k ,z = 15k
所以 (x + y + z)/(2x - y + z)
= (6k + 10k + 15k)/(12k - 10k + 15k)
= 31k/17k
= 31/17

因为x:y=3:5 , y:z=2:3 ,
设 x= 6k ,则 y = 10k ，z = 15k
所以 (x + y + z)/(2x - y + z)
= (6k + 10k + 15k)/(12k - 10k + 15k)
= 31k/17k
= 31/17

x:y=3:5
y:z=2:3
x:y:z=6:10:15
x=6k,y=10k,z=15k
X+Y+Z/2X-Y+Z
=6k+10k+15k/(12k-10k+15k)
=31/17

首先将X Z 用Y表示 X=3Y／5 Z=3Y／2代入x+y+z/2x-y+z中得（3Y／5 +3Y／2 +Y）／（2×3Y／5 +3Y／2 -Y）=31／17

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