1、已知m是方程x^2-x-2=0的一个根,则代数式m^2-m的值等于?2.、设x1、x2是方程3x^2+4x–5=0的两根,则1/x1+1/x2=?x1^2+x2^2=?Thanks a lot!
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![1、已知m是方程x^2-x-2=0的一个根,则代数式m^2-m的值等于?2.、设x1、x2是方程3x^2+4x–5=0的两根,则1/x1+1/x2=?x1^2+x2^2=?Thanks a lot!](/uploads/image/z/2396581-61-1.jpg?t=1%E3%80%81%E5%B7%B2%E7%9F%A5m%E6%98%AF%E6%96%B9%E7%A8%8Bx%5E2-x-2%3D0%E7%9A%84%E4%B8%80%E4%B8%AA%E6%A0%B9%2C%E5%88%99%E4%BB%A3%E6%95%B0%E5%BC%8Fm%5E2-m%E7%9A%84%E5%80%BC%E7%AD%89%E4%BA%8E%3F2.%E3%80%81%E8%AE%BEx1%E3%80%81x2%E6%98%AF%E6%96%B9%E7%A8%8B3x%5E2%2B4x%E2%80%935%3D0%E7%9A%84%E4%B8%A4%E6%A0%B9%2C%E5%88%991%2Fx1%2B1%2Fx2%3D%3Fx1%5E2%2Bx2%5E2%3D%3FThanks+a+lot%21)
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