x^2+5x+25 = X^2+5x+25/4-25/4+25 = (X+5/2)^2 =-75/4,无解

来源: 2022_2092 于 2023-02-02 11:35:51 [旧帖] [给我悄悄话] 本文已被阅读：次

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