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在初中《代数》课本中 ,运用配方法推导了实系数一元二次方程ａｘ2 +ｂｘ +ｃ =0在Δ =ｂ2 -4ａｃ≥ 0时的求根公式ｘ =-ｂ±ｂ2 -4ａｃ2ａ .①在高中《代数》下册“复数”一章中 ,运用配方法推导出实系数一元二次方程ａｘ2 +ｂｘ +ｃ=0在Δ =ｂ2 -4ａｃ0时的求根公式ｘ =-ｂ
In the “Algebra” textbook of junior middle school, using the matching method, the root formula of the real coefficient quadratic equation ax2 + bx + c = 0 at Δ = b2 -4ac ≥ 0 is deduced. x = -b ± b2 - 4ac2a .1 In the “complex number” chapter of the second volume of “Algebra” in high school, the real equation is derived using the matching method. The quadratic equation for one-variable equation ax2 +bx +c=0 is obtained when Δ = b2 −4ac0 x =-b