几道数学题(快!)1.若多项式x²-2xy+y²-x+y-1=0,求x-y的值2.若代数式(2m-1)x²+2(xm+1+4)是完全平方式,求m的值3.一元二次方程x(x-1)=x的解是( )4.关于x的方程x²-(a+b)x+ab=0的两根分别
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![几道数学题(快!)1.若多项式x²-2xy+y²-x+y-1=0,求x-y的值2.若代数式(2m-1)x²+2(xm+1+4)是完全平方式,求m的值3.一元二次方程x(x-1)=x的解是( )4.关于x的方程x²-(a+b)x+ab=0的两根分别](/uploads/image/z/1682727-15-7.jpg?t=%E5%87%A0%E9%81%93%E6%95%B0%E5%AD%A6%E9%A2%98%EF%BC%88%E5%BF%AB%21%EF%BC%891.%E8%8B%A5%E5%A4%9A%E9%A1%B9%E5%BC%8Fx%26%23178%3B-2xy%2By%26%23178%3B-x%2By-1%3D0%2C%E6%B1%82x-y%E7%9A%84%E5%80%BC2.%E8%8B%A5%E4%BB%A3%E6%95%B0%E5%BC%8F%EF%BC%882m-1%EF%BC%89x%26%23178%3B%2B2%EF%BC%88xm%2B1%2B4%EF%BC%89%E6%98%AF%E5%AE%8C%E5%85%A8%E5%B9%B3%E6%96%B9%E5%BC%8F%2C%E6%B1%82m%E7%9A%84%E5%80%BC3.%E4%B8%80%E5%85%83%E4%BA%8C%E6%AC%A1%E6%96%B9%E7%A8%8Bx%28x-1%29%3Dx%E7%9A%84%E8%A7%A3%E6%98%AF%EF%BC%88+%EF%BC%894.%E5%85%B3%E4%BA%8Ex%E7%9A%84%E6%96%B9%E7%A8%8Bx%26%23178%3B-%28a%2Bb%29x%2Bab%3D0%E7%9A%84%E4%B8%A4%E6%A0%B9%E5%88%86%E5%88%AB)
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