=IF(AND(A1<=140,A1>=106),"C",IF(AND(A1<=105,A1>=71),"B",IF(AND(A1<=70,A1>=35),"A","值超出范围")))
=IF(AND(A1<=140,A1>=106),"C",IF(AND(A1<=105,A1>=71),"B","A"))
140>=A1>=106 永远是对
140>=A1的值要么TRUE真要么FALSE
在EXcel中TRUE>FALSE>任何数字
=IF(AND(A1>=35,A1<=70),"a",IF(AND(A1>70,A1<=105),"B","c"))