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求 a 使 f(x) = \begincases x + a, x < 0 }, {x^2 + 1, x >= 0 \endcases 连续。(答:。)
求 a 使 f(x) = \begincases x + a, x < 0 }, {x^2 + 1, x >= 0 \endcases 连续。(答:。)
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