比如a单元格显示的字段是:aaaaa,bbbbb
b单元格展示的字段是:bbbbb,ccccc,ddddd
c单元格需要取a和b的并集并且去重,最后我要展示的结果是:aaaaa,bbbbb,ccccc,ddddd
请问这个公式需要怎么写
UNIQUEARRAY(SPLIT(A1+","+B1,","))
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UNIQUEARRAY(SPLIT(a1+b1,","))