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求 a 使 f(x) = \begincases x^2, x <= 1 }, {ax + 1, x > 1 \endcases 连续。(答:。)
求 a 使 f(x) = \begincases x^2, x <= 1 }, {ax + 1, x > 1 \endcases 连续。(答:。)
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