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在区间 [-2, 2] 上图形比较 f(x) = 2^x 和 g(x) = 3^x 。 取何值时 ？
在区间 [-2, 2] 上图形比较 f(x) = 2^x 和 g(x) = 3^x 。 取何值时 ？
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