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因為(1-a)的平方大於等於0 5-(1-a)的平方取最大值 則(1-a)的平方=0 解得a=1 3分之(2x-1)+a與代數式2分之3x+2的值相等 3分之(2x-1)+1=2分之3x+2 X=-2
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