1.设f(x)=ax^2+bx,且-1≤f(-1)≤2,2≤f(1)≤4,求f(-2)的取值范围2.已知函数f(x)=2x/(x^2+6),若f(x)>k的解为x-2,求k的值3.购买8角和2元的邮票若干张,并要求每种邮票至少要两张,如果小明带有10元钱,问有多少
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![1.设f(x)=ax^2+bx,且-1≤f(-1)≤2,2≤f(1)≤4,求f(-2)的取值范围2.已知函数f(x)=2x/(x^2+6),若f(x)>k的解为x-2,求k的值3.购买8角和2元的邮票若干张,并要求每种邮票至少要两张,如果小明带有10元钱,问有多少](/uploads/image/z/14783336-8-6.jpg?t=1.%E8%AE%BEf%28x%29%3Dax%5E2%2Bbx%2C%E4%B8%94-1%E2%89%A4f%28-1%29%E2%89%A42%2C2%E2%89%A4f%281%29%E2%89%A44%2C%E6%B1%82f%28-2%29%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B42.%E5%B7%B2%E7%9F%A5%E5%87%BD%E6%95%B0f%28x%29%3D2x%2F%28x%5E2%2B6%29%2C%E8%8B%A5f%28x%29%3Ek%E7%9A%84%E8%A7%A3%E4%B8%BAx-2%2C%E6%B1%82k%E7%9A%84%E5%80%BC3.%E8%B4%AD%E4%B9%B08%E8%A7%92%E5%92%8C2%E5%85%83%E7%9A%84%E9%82%AE%E7%A5%A8%E8%8B%A5%E5%B9%B2%E5%BC%A0%2C%E5%B9%B6%E8%A6%81%E6%B1%82%E6%AF%8F%E7%A7%8D%E9%82%AE%E7%A5%A8%E8%87%B3%E5%B0%91%E8%A6%81%E4%B8%A4%E5%BC%A0%2C%E5%A6%82%E6%9E%9C%E5%B0%8F%E6%98%8E%E5%B8%A6%E6%9C%8910%E5%85%83%E9%92%B1%2C%E9%97%AE%E6%9C%89%E5%A4%9A%E5%B0%91)
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