把抛物线y=-3(x-1)²向上平移k各单位,所得的抛物线与x轴交于点A(x1,0)B(x2,0,),若x1²+x2²=9分之26,请你求出k的值
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![把抛物线y=-3(x-1)²向上平移k各单位,所得的抛物线与x轴交于点A(x1,0)B(x2,0,),若x1²+x2²=9分之26,请你求出k的值](/uploads/image/z/7212985-25-5.jpg?t=%E6%8A%8A%E6%8A%9B%E7%89%A9%E7%BA%BFy%3D-3%EF%BC%88x-1%EF%BC%89%26%23178%3B%E5%90%91%E4%B8%8A%E5%B9%B3%E7%A7%BBk%E5%90%84%E5%8D%95%E4%BD%8D%2C%E6%89%80%E5%BE%97%E7%9A%84%E6%8A%9B%E7%89%A9%E7%BA%BF%E4%B8%8Ex%E8%BD%B4%E4%BA%A4%E4%BA%8E%E7%82%B9A%EF%BC%88x1%2C0%EF%BC%89B%EF%BC%88x2%2C0%2C%EF%BC%89%2C%E8%8B%A5x1%26%23178%3B%2Bx2%26%23178%3B%3D9%E5%88%86%E4%B9%8B26%2C%E8%AF%B7%E4%BD%A0%E6%B1%82%E5%87%BAk%E7%9A%84%E5%80%BC)
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把抛物线y=-3(x-1)²向上平移k各单位,所得的抛物线与x轴交于点A(x1,0)B(x2,0,),若x1²+x2²=9分之26,请你求出k的值
把抛物线y=-3(x-1)²向上平移k各单位,所得的抛物线与x轴交于点A(x1,0)
B(x2,0,),若x1²+x2²=9分之26,请你求出k的值
把抛物线y=-3(x-1)²向上平移k各单位,所得的抛物线与x轴交于点A(x1,0)B(x2,0,),若x1²+x2²=9分之26,请你求出k的值
y=-3(x-1)²向上平移k各单位,得y=-3(x-1)²+k
x1+x2=2 x1x2=(-3+k)/-3,代入x1²+x2²=9分之26 k=4/3