1方程ax^2+bx+4=0的两根分别为1和-3求a,b的值.2方程5x^2+bx+4=0的一根为2,求另一个根和k.3方程2x^2+bx+c=0的两根1和-2.求b,c.4若2x^2+3x-1=0的两根为x1和x2则x1^2+x2= 1/x1+1/x2=
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![1方程ax^2+bx+4=0的两根分别为1和-3求a,b的值.2方程5x^2+bx+4=0的一根为2,求另一个根和k.3方程2x^2+bx+c=0的两根1和-2.求b,c.4若2x^2+3x-1=0的两根为x1和x2则x1^2+x2= 1/x1+1/x2=](/uploads/image/z/10202888-56-8.jpg?t=1%E6%96%B9%E7%A8%8Bax%5E2%2Bbx%2B4%3D0%E7%9A%84%E4%B8%A4%E6%A0%B9%E5%88%86%E5%88%AB%E4%B8%BA1%E5%92%8C-3%E6%B1%82a%2Cb%E7%9A%84%E5%80%BC.2%E6%96%B9%E7%A8%8B5x%5E2%2Bbx%2B4%3D0%E7%9A%84%E4%B8%80%E6%A0%B9%E4%B8%BA2%2C%E6%B1%82%E5%8F%A6%E4%B8%80%E4%B8%AA%E6%A0%B9%E5%92%8Ck.3%E6%96%B9%E7%A8%8B2x%5E2%2Bbx%2Bc%3D0%E7%9A%84%E4%B8%A4%E6%A0%B91%E5%92%8C-2.%E6%B1%82b%2Cc.4%E8%8B%A52x%5E2%2B3x-1%3D0%E7%9A%84%E4%B8%A4%E6%A0%B9%E4%B8%BAx1%E5%92%8Cx2%E5%88%99x1%5E2%2Bx2%3D+1%2Fx1%2B1%2Fx2%3D)
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