x:y:z=4:7:8 x+y+2z=54 请即时演算过程.

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x:y:z=4:7:8 x+y+2z=54 请即时演算过程.
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x:y:z=4:7:8 x+y+2z=54 请即时演算过程.
x:y:z=4:7:8 x+y+2z=54 请即时演算过程.

x:y:z=4:7:8 x+y+2z=54 请即时演算过程.
x:y:z=4:7:8
则x/4=y/7=z/8
令a=x/4=y/7=z/8
x=4a
y=7a
z=8a
所以4a+7a+2×8a=54
27a=54
a=2
所以
x=4a=8
y=7a=14
z=8a=16

设x＝4A，y＝7A，z＝8A，得4A＋7A＋2＊8A＝54，得27A＝54，A＝2，x＝8，y＝14，z＝16

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