问三道高一函数题1.已知f(x)=ax²+bx+3a+b是偶函数,且其定义域为[a-1,2a],则a=?b=?2.已知函数f(x)是R上的奇函数,且当x>0时,f(x)=-x²+2x+2,求f(x)表达式.3.已知奇函数y=f(x)在(0,正无穷)上是增函数,试分
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![问三道高一函数题1.已知f(x)=ax²+bx+3a+b是偶函数,且其定义域为[a-1,2a],则a=?b=?2.已知函数f(x)是R上的奇函数,且当x>0时,f(x)=-x²+2x+2,求f(x)表达式.3.已知奇函数y=f(x)在(0,正无穷)上是增函数,试分](/uploads/image/z/7644827-11-7.jpg?t=%E9%97%AE%E4%B8%89%E9%81%93%E9%AB%98%E4%B8%80%E5%87%BD%E6%95%B0%E9%A2%981.%E5%B7%B2%E7%9F%A5f%28x%29%3Dax%26sup2%3B%2Bbx%2B3a%2Bb%E6%98%AF%E5%81%B6%E5%87%BD%E6%95%B0%2C%E4%B8%94%E5%85%B6%E5%AE%9A%E4%B9%89%E5%9F%9F%E4%B8%BA%5Ba-1%2C2a%5D%2C%E5%88%99a%3D%3Fb%3D%3F2.%E5%B7%B2%E7%9F%A5%E5%87%BD%E6%95%B0f%28x%29%E6%98%AFR%E4%B8%8A%E7%9A%84%E5%A5%87%E5%87%BD%E6%95%B0%2C%E4%B8%94%E5%BD%93x%3E0%E6%97%B6%2Cf%28x%29%3D-x%26sup2%3B%2B2x%2B2%2C%E6%B1%82f%28x%29%E8%A1%A8%E8%BE%BE%E5%BC%8F.3.%E5%B7%B2%E7%9F%A5%E5%A5%87%E5%87%BD%E6%95%B0y%3Df%28x%29%E5%9C%A8%280%2C%E6%AD%A3%E6%97%A0%E7%A9%B7%29%E4%B8%8A%E6%98%AF%E5%A2%9E%E5%87%BD%E6%95%B0%2C%E8%AF%95%E5%88%86)
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