集合 (17 7:46:51)设集合A={x/(x-3)(x-a)=0 ,a∈R} ,B={x/(x-4)(x-1)=0},求A∪B,A∩B
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集合 (17 7:46:51)设集合A={x/(x-3)(x-a)=0 ,a∈R} ,B={x/(x-4)(x-1)=0},求A∪B,A∩B
集合 (17 7:46:51)
设集合A={x/(x-3)(x-a)=0 ,a∈R} ,B={x/(x-4)(x-1)=0},求A∪B,A∩B
集合 (17 7:46:51)设集合A={x/(x-3)(x-a)=0 ,a∈R} ,B={x/(x-4)(x-1)=0},求A∪B,A∩B
A={x/(x-3)(x-a)=0 ,a∈R} ={3,a}
B={x/(x-4)(x-1)=0}={4,1}
A∪B={3,a,1,4},
A∩B={1}或{3}或{4},(a∈R)
当a=3时,A={3},B={1,4}
∴A∪B={1,3,4},A∩B=Φ
当a=1时,A={1,3},B={1,4}
∴A∪B={1,3,4},A∩B={1}
当a=4时,A={3,4},B={1,4}
∴A∪B={1,3,4},A∩B={4}
当a≠1,3,4时,A={3,a},B={1,4}
∴A∪B={1,3,4,a},A∩B=Φ