已知p=(x²)/(x-y)-(y²)/(x-y)Q=(x+y)²-2y(x+y)小敏 小聪两人在x=2 y=-1的条件下分别计算P Q的值 小敏说p值比Q大 小聪说Q值比p大请你判断结论 并说明理由
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![已知p=(x²)/(x-y)-(y²)/(x-y)Q=(x+y)²-2y(x+y)小敏 小聪两人在x=2 y=-1的条件下分别计算P Q的值 小敏说p值比Q大 小聪说Q值比p大请你判断结论 并说明理由](/uploads/image/z/4323557-29-7.jpg?t=%E5%B7%B2%E7%9F%A5p%3D%EF%BC%88x%26%23178%3B%EF%BC%89%2F%EF%BC%88x-y%EF%BC%89-%EF%BC%88y%26%23178%3B%EF%BC%89%2F%EF%BC%88x-y%EF%BC%89Q%3D%EF%BC%88x%2By%EF%BC%89%26%23178%3B-2y%EF%BC%88x%2By%EF%BC%89%E5%B0%8F%E6%95%8F+%E5%B0%8F%E8%81%AA%E4%B8%A4%E4%BA%BA%E5%9C%A8x%3D2+y%3D-1%E7%9A%84%E6%9D%A1%E4%BB%B6%E4%B8%8B%E5%88%86%E5%88%AB%E8%AE%A1%E7%AE%97P+Q%E7%9A%84%E5%80%BC+%E5%B0%8F%E6%95%8F%E8%AF%B4p%E5%80%BC%E6%AF%94Q%E5%A4%A7+%E5%B0%8F%E8%81%AA%E8%AF%B4Q%E5%80%BC%E6%AF%94p%E5%A4%A7%E8%AF%B7%E4%BD%A0%E5%88%A4%E6%96%AD%E7%BB%93%E8%AE%BA+%E5%B9%B6%E8%AF%B4%E6%98%8E%E7%90%86%E7%94%B1)
已知p=(x²)/(x-y)-(y²)/(x-y)Q=(x+y)²-2y(x+y)小敏 小聪两人在x=2 y=-1的条件下分别计算P Q的值 小敏说p值比Q大 小聪说Q值比p大请你判断结论 并说明理由
已知p=(x²)/(x-y)-(y²)/(x-y)Q=(x+y)²-2y(x+y)小敏 小聪两人在x=2 y=-1的条件下分别计算P Q的值 小敏说p值比Q大 小聪说Q值比p大请你判断结论 并说明理由
已知p=(x²)/(x-y)-(y²)/(x-y)Q=(x+y)²-2y(x+y)小敏 小聪两人在x=2 y=-1的条件下分别计算P Q的值 小敏说p值比Q大 小聪说Q值比p大请你判断结论 并说明理由
P=(x²-y²)/(x-y)
=(x+y)(x-y)/(x-y)
=x+y
=2-1
=1
Q=(x+y)(x+y-2y)
=(x+y)(x-y)
=(2-1)×(2+1)
=3
所以P小聪说得对
P=(x²-y²)/(x-y)
=(x+y)(x-y)/(x-y)
=x+y
=2-1
=1
Q=(x+y)(x+y-2y)
=(x+y)(x-y)
=(2-1)×(2+1)
=3
所以P