不解方程,由根与系数的关系确定两根的符号(1)当b²-4ac≥0,且x1 x2=a分之c>0时,两根______,此时:若x1+x2=-a分之b>0.两根_____,若x1加x2=-a分之b<0,两根同————.(2)当b平方-4ac≥0.且x1x2
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![不解方程,由根与系数的关系确定两根的符号(1)当b²-4ac≥0,且x1 x2=a分之c>0时,两根______,此时:若x1+x2=-a分之b>0.两根_____,若x1加x2=-a分之b<0,两根同————.(2)当b平方-4ac≥0.且x1x2](/uploads/image/z/14033248-16-8.jpg?t=%E4%B8%8D%E8%A7%A3%E6%96%B9%E7%A8%8B%2C%E7%94%B1%E6%A0%B9%E4%B8%8E%E7%B3%BB%E6%95%B0%E7%9A%84%E5%85%B3%E7%B3%BB%E7%A1%AE%E5%AE%9A%E4%B8%A4%E6%A0%B9%E7%9A%84%E7%AC%A6%E5%8F%B7%EF%BC%881%EF%BC%89%E5%BD%93b%26%23178%3B%EF%BC%8D4ac%E2%89%A50%2C%E4%B8%94x1+x2%3Da%E5%88%86%E4%B9%8Bc%EF%BC%9E0%E6%97%B6%2C%E4%B8%A4%E6%A0%B9______%2C%E6%AD%A4%E6%97%B6%EF%BC%9A%E8%8B%A5x1%2Bx2%3D%EF%BC%8Da%E5%88%86%E4%B9%8Bb%EF%BC%9E0.%E4%B8%A4%E6%A0%B9_____%2C%E8%8B%A5x1%E5%8A%A0x2%3D-a%E5%88%86%E4%B9%8Bb%EF%BC%9C0%2C%E4%B8%A4%E6%A0%B9%E5%90%8C%E2%80%94%E2%80%94%E2%80%94%E2%80%94.%EF%BC%882%EF%BC%89%E5%BD%93b%E5%B9%B3%E6%96%B9-4ac%E2%89%A50.%E4%B8%94x1x2)
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