解方程3 x 1 2 4 x 1:x-1/x-2 - x-2/x...

知识点梳理
【公式法】一般步骤:第一步:化为一般形式,即&{{ax}^{2}}+bx+c=0(a≠0);第二步:确定&a&、&b&、&c&的值,并计算&{{b}^{2}}-4ac&的值;第三步:当&{{b}^{2}}-4ac≥0&时,将&a&、&b&、&c&及&{{b}^{2}}-4ac&的值代入求根公式,得出方程的根&x={\frac{-b±\sqrt[]{{{b}^{2}}-4ac}}{2a}};当&{{b}^{2}}-4ac<0&时,方程无根.
【因式分解法】一般步骤:第一步:将已知化为一般形式,使方程右端为&0;第二步:将左端的二次三项式分解为两个一次因式的积;第三步:方程左边两个因式分别为&0,得到两个一次方程,它们的解就是原方程的解.
整理教师:&&
举一反三(巩固练习,成绩显著提升,去)
根据问他()知识点分析,
试题“用适当的方法解下列方程:(1)(3x-1)(x-2)=(4x...”,相似的试题还有:
请选择适当的方法解下列一元二次方程(1)x2-4x=0&&&&&&&&&&&&&&&&&&&&&&&&&&&&&
(2)4x2-25=0
(3)2x(x-3)+x=3
(4)x2+3=4x
(5)2x2-3x-1=0&&&&&&&&&&&&&&&&&&&&&&&&&&&
(6)2x2-4x-3=0.
用适当的方法解下列方程.(1)3x2-4x+1=0;(2)2x2-4x-1=0;(3)2x2+1=3x;(4)(x-3)2+4(x-3)=0.
用适当的方法解下列方程(1)x2-4x+1=0(2)x2+5x+7=0(3)3x(x-1)=2-2x> 问题详情
已知方程x3+2x2-5x-6=0的根为x1=-1,x2,x3,则1/x2+1/x3=().A.1/6B.1/5C.1/4D.1/3E.1/2
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已知方程x3+2x2-5x-6=0的根为x1=-1,x2,x3,则1/x2+1/x3=( ).A.1/6B.1/5C.1/4D.1/3E.1/2请帮忙给出正确答案和分析,谢谢!
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