多项选择题

A.P=A(P/A,i,n-m+1)(P/F,i,m-k-1)
B.P=A(P/A,i,n-m+1)(P/F,i,n-k)
C.P=A(F/A,i,n-m+1)(P/F,i,m-k-1)
D.P=A(F/A,i,n-m+1)(P/F,i,n-k)
E.P=A(P/A,i,n-k)-A(P/A,i,m-k-1)