如果x:y:z=3:2:4,且x-3y+2z不等于0,那么2x+y-3z/x-3y+2z=( )
3个回答
设x=3k,则y=2k,z=4k
(2x+y-3z)/(x-3y+2z)
=(6k+2k-12k)/(3k-6k+8k)
=-4k/5k
=-4/5
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