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若x²;-ax+2a-4是完全平管道, 則,x²;-ax+2a-4 =(x-b)^2 -2b=-a b=a/2 2a-4=b^2 那麼,2a-4=a^2/4 8a-16-a^2=0 a^2-8a+16=0 (a-4)^2=0 所以,a=4
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