下列哪些是方程x²-4x-5=0的根?-5,-4,-3,-2,-1,0,1,2,3,4,5选快
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![下列哪些是方程x²-4x-5=0的根?-5,-4,-3,-2,-1,0,1,2,3,4,5选快](/uploads/image/z/2734693-61-3.jpg?t=%E4%B8%8B%E5%88%97%E5%93%AA%E4%BA%9B%E6%98%AF%E6%96%B9%E7%A8%8Bx%26%23178%3B-4x-5%3D0%E7%9A%84%E6%A0%B9%3F-5%2C-4%2C-3%2C-2%2C-1%2C0%2C1%2C2%2C3%2C4%2C5%E9%80%89%E5%BF%AB)
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下列哪些是方程x²-4x-5=0的根?-5,-4,-3,-2,-1,0,1,2,3,4,5选快
下列哪些是方程x²-4x-5=0的根?-5,-4,-3,-2,-1,0,1,2,3,4,5选
快
下列哪些是方程x²-4x-5=0的根?-5,-4,-3,-2,-1,0,1,2,3,4,5选快
x²-4x-5=0
(x-5)(x+1)=0
x1=5,x2=-1
-1,5
x²-4x-5=0
(x+1)(x-5)=0
x1=-1
x2=5
所以选:-1和5。
-1满足方程,由韦达定理,5也是的,共两个没有了;