A、2.1×(P/F,12%,1)+2.205×(P/F,12%,2)+22.05×(1+2%)×(P/F,12%,2)
B、2.1/(12%-5%)+22.05×(1+2%)×(P/F,12%,2)
C、2.1×(P/F,12%,1)+2.205×(P/F,12%,2)+22.05×(1+2%)×(P/F,12%,3)
D、2.1/(12%-5%)+22.05×(1+2%)×(P/F,12%,3)