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a=0時,x=-2/3,此時A={-2/3} a≠0時,若A為單元素集合,方程ax^2-3x-2=0須有兩個等根. △=0,即9+8a=0,a=-9/8. 解方程-9/8x^2-3x-2=0得 x=-4/3,此時A={-4/3}.
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