①[a−b/a]×100%;
②a=40,出勤率是95%,则:
[40−b/40]×100%=95%,
则:40-b=0.95×40,
40-a=38,
a=2;
答:出勤率是[a−b/a]×100%;如果a=40,出勤率是95%,那么b是2人;
故答案为:[a−b/a]×100%,2.
①[a−b/a]×100%;
②a=40,出勤率是95%,则:
[40−b/40]×100%=95%,
则:40-b=0.95×40,
40-a=38,
a=2;
答:出勤率是[a−b/a]×100%;如果a=40,出勤率是95%,那么b是2人;
故答案为:[a−b/a]×100%,2.