数学解一元二次方程,X2-X-2=0化成(X-2)(X+1)=02X2-5X-3=0化成(2X+1)(X-3)=0是怎么的来的啊?记得以前学了.不记得了.
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![数学解一元二次方程,X2-X-2=0化成(X-2)(X+1)=02X2-5X-3=0化成(2X+1)(X-3)=0是怎么的来的啊?记得以前学了.不记得了.](/uploads/image/z/3721612-4-2.jpg?t=%E6%95%B0%E5%AD%A6%E8%A7%A3%E4%B8%80%E5%85%83%E4%BA%8C%E6%AC%A1%E6%96%B9%E7%A8%8B%2CX2%EF%BC%8DX-2%3D0%E5%8C%96%E6%88%90%EF%BC%88X-2%EF%BC%89%EF%BC%88X%2B1%EF%BC%89%3D02X2-5X-3%3D0%E5%8C%96%E6%88%90%EF%BC%882X%2B1%EF%BC%89%EF%BC%88X-3%EF%BC%89%3D0%E6%98%AF%E6%80%8E%E4%B9%88%E7%9A%84%E6%9D%A5%E7%9A%84%E5%95%8A%3F%E8%AE%B0%E5%BE%97%E4%BB%A5%E5%89%8D%E5%AD%A6%E4%BA%86.%E4%B8%8D%E8%AE%B0%E5%BE%97%E4%BA%86.)
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