主题：请教筛选问题

以三个变量进行组合筛选.搞了两天没有写出来.不知咋搞了.请教大侠公式是否有顺序错误或格式错误,抑或其它错误?
Selcase(
[A]="",FilterFor("b","=",[%b%],"c","=",[%c%]),
[b]="",FilterFor("A","=",[%A%],"c","=",[%c%]),
[c]="",FilterFor("A","=",[%A%],"b","=",[%b%]),
[A]=""and [b]="",FilterFor("c","=",[%c%]),
[A]=""and [c]="",FilterFor("b","=",[%b%]),
[b]=""and [c]="",FilterFor("A","=",[%A%]),
FilterFor("A","=",[%A%],"b","=",[%b%],"c","=",[%c%])
)

你这个明显不对,怎么把变量放前了呢.那是列内容