已知｛2x-5y=0 则x+y+z/2y= x-6y+3z=0

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已知｛2x-5y=0则x+y+z/2y=x-6y+3z=0已知｛2x-5y=0则x+y+z/2y=x-6y+3z=0已知｛2x-5y=0则x+y+z/2y=x-6y+3z=02x-5y=0x=5y/2

已知｛2x-5y=0 则x+y+z/2y= x-6y+3z=0
已知｛2x-5y=0 则x+y+z/2y= x-6y+3z=0

已知｛2x-5y=0 则x+y+z/2y= x-6y+3z=0
2x-5y=0 x=5y/2①
x-6y+3z=0 ②
①代入②得 5y/2-6y+3z=0 即 3z=7y/2,z=7y/6
∴(x+y+z)/2y=(5y/2+y+7y/6)/y=(5/2+1+7/6)y/y=14/3

2x-5y=0,x=2.5y
x+y+z/2y=0,z=7y*y
x-6y+3z=0,z=1.5y
y=15/7
x=75/7
z=45/14

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5y=2X
将2乘以（x-6y+3z）=2x-12y+6z=0
将5y=2X代入得17y=6z
x+y+z乘以2得2x+2y+2z
再代5y=2X
得7y+2z
7y+2z乘以3得21y+6z
最后将17y=6z代入得38y
所以x/2y+y+z化为38y/2y
答案为19
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