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2x²;+x+3=0,2(x²;+2·x·¼;+(¼;)²;)=-3+(1/8).2(x+¼;)²;=-23/8.(x+¼;)²;=-23/16.【沒有一個實數的平方是負數!】所以,這個方程,在實數集無解,或者說解集為“空集…
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