x:y:z=3:4:7,且2x-y+z=18,那么x+2Y-z+( )
4个回答
设x=3k,y=4k,z=7k
则满足x:y:z=3:4:7
2x-y+z=6k-4k+7k=9k=18,所以k=2
x+2y-z=3k+8k-7k=4k=4×2=8
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