A={1,3a},B={1,a²-a+1},求A∪B

A={1,3a},B={1,a²-a+1},求A∪B
A={1,3a},B={1,a²-a+1},求A∪B

A={1,3a},B={1,a²-a+1},求A∪B
必有a^2-a+1<>1且3a<>1 不等号<>
a^2-a+1=3a,a=2+√3 huo 2-√3
A∪B={1,6+3√3} 或{1,6-3√3}
当a不等于2+√3 huo 2-√3时
A∪B ={1,a²-a+1,3a}

采纳~~~