2x²-5x-4=0 用配方解!谢谢各位大神啦!2x²-5x-4=0
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![2x²-5x-4=0 用配方解!谢谢各位大神啦!2x²-5x-4=0](/uploads/image/z/1632620-20-0.jpg?t=2x%26%23178%3B-5x-4%3D0+%E7%94%A8%E9%85%8D%E6%96%B9%E8%A7%A3%21%E8%B0%A2%E8%B0%A2%E5%90%84%E4%BD%8D%E5%A4%A7%E7%A5%9E%E5%95%A6%212x%26%23178%3B-5x-4%3D0)
2x²-5x-4=0 用配方解!谢谢各位大神啦!2x²-5x-4=0
2x²-5x-4=0 用配方解!谢谢各位大神啦!
2x²-5x-4=0
2x²-5x-4=0 用配方解!谢谢各位大神啦!2x²-5x-4=0
2x²-5x-4=0
x²-5x/2-2=0
x²-5x/2+(5/4)²=2+25/16
(x-5/4)²=57/16
x-5/4=±√(57/16)
x=5/4±√57/4
x1=(5+√57)/4 x2=(5-√57)/4