【(x²+3x-18)/(x²+6x)】/(x²+9-6x)
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【(x²+3x-18)/(x²+6x)】/(x²+9-6x)
![【(x²+3x-18)/(x²+6x)】/(x²+9-6x)](/uploads/image/z/18814994-26-4.jpg?t=%E3%80%90%EF%BC%88x%26%23178%3B%2B3x-18%EF%BC%89%2F%EF%BC%88x%26%23178%3B%2B6x%EF%BC%89%E3%80%91%2F%EF%BC%88x%26%23178%3B%2B9-6x%EF%BC%89)
=(x+6)(x-3)/x(x+6)÷(x-3)²
=1/x(x-3)
=1/x(x-3)
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