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因為Δ=b^2-4ac=6*6-4*9*1=0 所以x=[-b±根號(b^2-4ac)]/2a=-6/2*9=-1/3 即y=9x²;+6x+1當x=-1/3時,與Y軸有唯一一個交點(-1/3,0) 當x不等於-1/3時,y=9x²;+6x+1>0.
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