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对于一元二次方程ax2+bx+c=0来说,“a≠0(确定是一元二次方程)→Δ=b2-4ac≥0(确定方程有解)→韦达定理→分解因式”形成应用上的一条主线.按箭头的方向,后者的应用必须建立在前者成立的基础之上,我们不妨称其为一元二次方程的“一线(即应用主线)三点(判别式、韦达定理、分解因式).本文对”一线三点“在中考中的应用作归类例析,以供读者参考.
For the quadratic equation ax2 + bx + c = 0, ”a ≠ 0 (to determine the quadratic equation) → Δ = b2-4ac ≥ 0 (to determine the equation there is a solution) → Veda Theorem → factorization factor “In the direction of the arrow, the latter application must be based on the former foundation, we may wish to call it a dollar quadratic equation ” first line (that is, the main line of application) three points Type, Vedic theorem, factorization factor) .This article classifies and analyzes the application of “one line and three points ” in senior high school entrance examination for readers’ reference.