计算下列分段函数f(x)f(x)的值(保留1位小数).
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![计算下列分段函数f(x)f(x)的值(保留1位小数).](/uploads/image/f/7217189-53-9.jpg?t=%E8%AE%A1%E7%AE%97%E4%B8%8B%E5%88%97%E5%88%86%E6%AE%B5%E5%87%BD%E6%95%B0f%28x%29f%28x%29%E7%9A%84%E5%80%BC%28%E4%BF%9D%E7%95%991%E4%BD%8D%E5%B0%8F%E6%95%B0%29.)
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