问题:
A . (F/A,i,n)=(F/P,i,n)×(P/A,i,n)B . (F/P,i,n)=(F/P,i,n1)×(F/P,i,n2)其中n1+n2=nC . (P/F,i,n)=(P/F,i,n1)+(P/F,i,n2)其中n1+n2=nD . (P/A,i.n)=(P/F,i,n)/(A/F,i,n)E . 1/(F/A,i,n)=(A/F,i,n)
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