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整体代入法求分式的值，这题有多少人答案可以秒出？方法2也不难
整体代入法求分式的值，这题有多少人答案可以秒出？请举手！方法二也不难，且应用很广泛。
八年级数学：分式的定义和化简，解分式方程，应用题，培优专题104/333
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