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一些同学解一元二次方程和二次函数时常忽略二次项系数a的取值范围和根的判别式Δ≥0这两个重要条件,造成漏解或错解.现举几例予于剖析,帮助同学们走出
Some students solve unary quadratic equations and quadratic functions often ignore the range of quadratic coefficient a and the discriminant of roots Δ≥0 these two important conditions, resulting in leakage or misinterpretation. , To help students get out