已知x /3=y /4=z /5,则x+y / x-2y+3z的值为?
2个回答
x /3=y /4=z /5=k,
x=3k,y=4k,z=5k,
(x+y)/(x-2y+3z)
=(3k+4k)/(3k-8k+15k)
=(7k)/(10k)
=7/10.
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