先化简 再求值 (x²-6x+9)/(x²-4)其中x=3 (x²-4x)/(x²-8x+16)其中x=5
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![先化简 再求值 (x²-6x+9)/(x²-4)其中x=3 (x²-4x)/(x²-8x+16)其中x=5](/uploads/image/z/1612385-17-5.jpg?t=%E5%85%88%E5%8C%96%E7%AE%80+%E5%86%8D%E6%B1%82%E5%80%BC+%EF%BC%88x%26%23178%3B-6x%2B9%EF%BC%89%2F%EF%BC%88x%26%23178%3B-4%EF%BC%89%E5%85%B6%E4%B8%ADx%3D3+%EF%BC%88x%26%23178%3B-4x%EF%BC%89%2F%EF%BC%88x%26%23178%3B-8x%2B16%EF%BC%89%E5%85%B6%E4%B8%ADx%3D5)
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先化简 再求值 (x²-6x+9)/(x²-4)其中x=3 (x²-4x)/(x²-8x+16)其中x=5
先化简 再求值 (x²-6x+9)/(x²-4)其中x=3
(x²-4x)/(x²-8x+16)其中x=5
先化简 再求值 (x²-6x+9)/(x²-4)其中x=3 (x²-4x)/(x²-8x+16)其中x=5
原式=(x-3)²/(x+2)(x-2)
=(3-3)²/(3+2)(3-2)
=0
原式=x(x-4)/(x-4)²
=x/(x-4)
=5/(5-4)
=5