(1)设f(x)=x²+ax+b,A={x/f(x)=x}={a},求a,b的值(2)设函数y=ax+2a+1,当-1≤x≤1时,y的值有正有负,则实数a的范围为
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![(1)设f(x)=x²+ax+b,A={x/f(x)=x}={a},求a,b的值(2)设函数y=ax+2a+1,当-1≤x≤1时,y的值有正有负,则实数a的范围为](/uploads/image/z/4111897-49-7.jpg?t=%EF%BC%881%EF%BC%89%E8%AE%BEf%EF%BC%88x%EF%BC%89%3Dx%26sup2%3B%2Bax%2Bb%2CA%3D%EF%BD%9Bx%EF%BC%8Ff%EF%BC%88x%EF%BC%89%3Dx%EF%BD%9D%3D%EF%BD%9Ba%EF%BD%9D%2C%E6%B1%82a%2Cb%E7%9A%84%E5%80%BC%EF%BC%882%EF%BC%89%E8%AE%BE%E5%87%BD%E6%95%B0y%3Dax%2B2a%2B1%2C%E5%BD%93-1%E2%89%A4x%E2%89%A41%E6%97%B6%2Cy%E7%9A%84%E5%80%BC%E6%9C%89%E6%AD%A3%E6%9C%89%E8%B4%9F%2C%E5%88%99%E5%AE%9E%E6%95%B0a%E7%9A%84%E8%8C%83%E5%9B%B4%E4%B8%BA)
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