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实系数一元二次方程ax2+bx+c=0(a≠0)有实数根的充要条件是判别式Δ=b2-4ac≥0,在高中数学中应用判别式的等价性解决问题应引起师生的充分重视。
Real coefficients quadratic equation ax2 + bx + c = 0 (a ≠ 0) has real roots necessary and sufficient conditions for the discriminant Δ = b2-4ac ≥ 0, in high school mathematics, the use of discriminant equivalence to solve the problem should be Aroused the full attention of teachers and students.