2025年教学资料:2.3一元二次不等式(分层作业)(解析版)
2.3一元二次不等式分层作业1.一元二次不等式的解集为( )A.B.C.D.【答案】D【分析】直接解一元二次不等式即可.【详解】由,解得或,即原不等式解集为.故选:D2.不等式的解集为( )A.B.C.,或D.,或【答案】B【分析】对于二次项系数是负数的一元二次不等式,可以先把二次项系数化成正数,再求解.【详解】不等式可化为,解得.故选:B.3.不等式的解集为 .【答案】或【分析】根据一元二次不等式的解集公式可直接求得结果.基础巩固【详解】不等式可化为,解得或,∴原不等式的解集为或.故答案为:或.4. 当自变量x在什么范围取值时,函数y=3x2-6x+2的值等于0?大...
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