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设集合A与B的一种运算*为:A*B={x︱x=ab,a∈A,b∈B}.若A={1,2},B={0,2},求A*B中的所有元素
设集合A与B的一种运算*为:A*B={x︱x=ab,a∈A,b∈B}.若A={1,2},B={0,2},求A*B中的所有元素
发布时间:2020-08-04 21:14:57
设集合A与B的一种运算*为 :A * B = {x︱x = a b ,a∈A ,b∈B } .若A = {1 ,2} ,B ={0 ,2} ,求A * B中的所有元素之和
网友回答
6解析解 :当a = 1时 ,b = 0或2 ,那么x = 0 ,2 ,
当a = 2时 ,b = 0或2 ,那么x = 0,4 ,
考虑到集合中元素的互异性 ,A * B = {0 ,2 ,4} ,
∴A * B中的所有元素之和为6 .
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