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已知集合A={x∈R|ax2-3x+2=0，a∈R}，若A中元素至多有1个，则a的取值范围是______．
已知集合A={x∈R|ax2-3x+2=0，a∈R}，若A中元素至多有1个，则a的取值范围是______．
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2020-02-08 23:09
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刘轩黄
由题意，方程ax2-3x+2=0，a∈R的解至多有1个
①a=0时，方程-3x+2=0，只有一个解；
②a≠0时，方程ax2-3x+2=0，a∈R的解至多有1个
则△=9-8a≤0，∴a≥98
2020-02-08 23:10:28
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