由等式里变形,x=2y/3 ,z=4y/3,把其代入所求的式子,最后的结果是27/8y^2.所以本题的结果是不肯定的,所以只能选D
若x/2=y/3=z/4,则(x+y+z)/xyz的值为( ) A.3/8 B.8/3 C.1/3 D无法确定
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