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一元二次方程的培优题，方法不是最好，但是不是最容易想到？
根据方程的解的情形，来倒推参数的取值范围，算不算常规思维
中考数学压轴题专辑119/130
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根据方程的解的情形，来倒推参数的取值范围，算不算常规思维
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