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簡單回答如下:1)分子有理化;2)分子分母同乘[4+2*三次方根x+三次方根(x^2)];3)這時分子分母都有(x+8),把它消去,極限就出來了.注:1,步驟1)2)可以同時進行;2,分子分母的處理辦法本質上是一樣的,都是為了消…
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