分式分解：=IF(AND(COUNTIF(Sheet1!$A$2:$A$232,LEFT(A3,FIND("*",SUBSTITUTE(A3,":","*",LEN(A3)-LEN(SUBSTITUTE(A3,":",""))))-1))=1,ISERROR(FIND(" ",A3)),COUNTIF(A:A,A3)=1),"正确",【嵌套1】)
正确【嵌套1】：=IF(A3"","A",【嵌套2】)
正确【嵌套2】：=IF(NOT(ISERROR(FIND(" ",A3))),"有空格",【嵌套3】)
正确【嵌套3】：=IF(COUNTIF(A:A,A3...
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