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我们先来看两个关于x的一元二次方程ax2+bx+c=0(a≠0)①x2+bx+ac=0②的根之间的联系:定理若方程①、②之一有实根,则它们均有实
Let us first look at the connection between the roots of two univariate quadratic equations on x ax2 + bx + c = 0 (a ≠ 0) ①x2 + bx + ac = 0 ②: Theorem If one of the equations , They are all real