设一元二次方程x²-7x+3=0的两根为x^1,x^2,则x^1+x^2= ,x设一元二次方程x²-7x+3=0的两根为x^1,x^2,则x^1+x^2= ,x^1×x^2= ,(x^1-2)(x^2-2)= .
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![设一元二次方程x²-7x+3=0的两根为x^1,x^2,则x^1+x^2= ,x设一元二次方程x²-7x+3=0的两根为x^1,x^2,则x^1+x^2= ,x^1×x^2= ,(x^1-2)(x^2-2)= .](/uploads/image/z/3738601-1-1.jpg?t=%E8%AE%BE%E4%B8%80%E5%85%83%E4%BA%8C%E6%AC%A1%E6%96%B9%E7%A8%8Bx%26%23178%3B-7x%2B3%3D0%E7%9A%84%E4%B8%A4%E6%A0%B9%E4%B8%BAx%5E1%2Cx%5E2%2C%E5%88%99x%5E1%2Bx%5E2%3D+%2Cx%E8%AE%BE%E4%B8%80%E5%85%83%E4%BA%8C%E6%AC%A1%E6%96%B9%E7%A8%8Bx%26%23178%3B-7x%2B3%3D0%E7%9A%84%E4%B8%A4%E6%A0%B9%E4%B8%BAx%5E1%2Cx%5E2%2C%E5%88%99x%5E1%2Bx%5E2%3D+%2Cx%5E1%C3%97x%5E2%3D+%2C%EF%BC%88x%5E1-2%EF%BC%89%EF%BC%88x%5E2-2%EF%BC%89%3D+.)
设一元二次方程x²-7x+3=0的两根为x^1,x^2,则x^1+x^2= ,x设一元二次方程x²-7x+3=0的两根为x^1,x^2,则x^1+x^2= ,x^1×x^2= ,(x^1-2)(x^2-2)= .
设一元二次方程x²-7x+3=0的两根为x^1,x^2,则x^1+x^2= ,x
设一元二次方程x²-7x+3=0的两根为x^1,x^2,则x^1+x^2= ,x^1×x^2= ,(x^1-2)(x^2-2)= .
设一元二次方程x²-7x+3=0的两根为x^1,x^2,则x^1+x^2= ,x设一元二次方程x²-7x+3=0的两根为x^1,x^2,则x^1+x^2= ,x^1×x^2= ,(x^1-2)(x^2-2)= .
储备知识
在一元二次方程ax^2+bx+c=0中的两根x1,x2
根据韦达定理有
x1+x2=-b/a
x1x2=c/a
x1+x2=7
x1x2=3
(x1-2)(x2-2)=x1x2-2(x1+x2)+4=3-2×7+4=-7
答题不易,且回且珍惜
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