多项选择题

A.1000×(P/A,8%,4)×(P/F,8%,4)
B.1000×[(P/A,8%,8)-(P/A,8%,4)]
C.1000×[(P/A,8%,7)-(P/A,8%,3)]
D.1000×(F/A,8%,4)×(P/F,8%,7)