4.若方程x²+x+q=0有两个虚根α,β,且|α-β|=3,则实数q的值是A.2.5 B.-2.5 C.2 D.-212.已知f(x)是定义在R上的偶函数,若g(x)是奇函数,且g(x)=f(x-1),g(2)=2001,则f(1999)的值等于A.-2000 B.-2001 C.200
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![4.若方程x²+x+q=0有两个虚根α,β,且|α-β|=3,则实数q的值是A.2.5 B.-2.5 C.2 D.-212.已知f(x)是定义在R上的偶函数,若g(x)是奇函数,且g(x)=f(x-1),g(2)=2001,则f(1999)的值等于A.-2000 B.-2001 C.200](/uploads/image/z/8152463-47-3.jpg?t=4.%E8%8B%A5%E6%96%B9%E7%A8%8Bx%26sup2%3B%EF%BC%8Bx%EF%BC%8Bq%EF%BC%9D0%E6%9C%89%E4%B8%A4%E4%B8%AA%E8%99%9A%E6%A0%B9%CE%B1%2C%CE%B2%2C%E4%B8%94%EF%BD%9C%CE%B1%EF%BC%8D%CE%B2%EF%BD%9C%EF%BC%9D3%2C%E5%88%99%E5%AE%9E%E6%95%B0q%E7%9A%84%E5%80%BC%E6%98%AFA.2.5+B.%EF%BC%8D2.5+C.2+D.%EF%BC%8D212.%E5%B7%B2%E7%9F%A5f%28x%29%E6%98%AF%E5%AE%9A%E4%B9%89%E5%9C%A8R%E4%B8%8A%E7%9A%84%E5%81%B6%E5%87%BD%E6%95%B0%2C%E8%8B%A5g%28x%29%E6%98%AF%E5%A5%87%E5%87%BD%E6%95%B0%2C%E4%B8%94g%28x%29%3Df%28x-1%29%2Cg%282%29%3D2001%2C%E5%88%99f%281999%29%E7%9A%84%E5%80%BC%E7%AD%89%E4%BA%8EA.%EF%BC%8D2000+B.%EF%BC%8D2001+C.200)
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