当a是怎样的实数时,下列各式才有意义 (1)√a+2 (2)√3-a(3)√5a(4)√-a 还有这些是怎样算的.
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![当a是怎样的实数时,下列各式才有意义 (1)√a+2 (2)√3-a(3)√5a(4)√-a 还有这些是怎样算的.](/uploads/image/z/10190021-5-1.jpg?t=%E5%BD%93a%E6%98%AF%E6%80%8E%E6%A0%B7%E7%9A%84%E5%AE%9E%E6%95%B0%E6%97%B6%2C%E4%B8%8B%E5%88%97%E5%90%84%E5%BC%8F%E6%89%8D%E6%9C%89%E6%84%8F%E4%B9%89+%281%29%E2%88%9Aa%2B2+%282%29%E2%88%9A3-a%283%29%E2%88%9A5a%284%29%E2%88%9A-a+%E8%BF%98%E6%9C%89%E8%BF%99%E4%BA%9B%E6%98%AF%E6%80%8E%E6%A0%B7%E7%AE%97%E7%9A%84.)
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