若\(A(0,2,\dfrac{19}{8})\),\(B(1,-1,\dfrac{5}{8})\),\(C(-2,1,\dfrac{5}{8})\)是平面\(\alpha \)内的三点,设平面\(\alpha \)的法向量\(\vec{a}=(x,y,z)\),则\(x:y:z=\)________________。
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