输入=IF(AND(M4<=0.5,N4<=1,M4+N4<=1.5),0.11,IF(AND(M4<=1.5,N4<=2.5,M4+N4<=4),0.08,IF(AND(M4<=2.5,N4<=3.5,M4+N4<=6),0.04,0)))*工资单元格
M4+N4是不是应该有括号？
累计天数这个条件是怎么计算的？
