=IF(A1>=0,IF(A1<=3,"小",IF(A1<=6,"中",IF(A1<=9,"大","特大"))),"不能小于0")
=IF(AND(A1>=0,A1<=3),"小",IF(AND(A1>=4,A1<=6),"中",IF(AND(A1>=7,A1<=9),"大","")))
=if(x<0,"",if(x<=3,"小",if(x<=6,"中",if(x<=9,"大",""))))
B1
=if(a1<=3,"小",if(a1<=6,"中",if(a1,<=9,"大","太大")))
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