[],;[],,,,,,,,,,,,,,,,()(),,,:,;,,,;,(),:,,,,,,,,,,,,(),:©1995-2003TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.,,,,:,,,,,,,:,,:11?,,,,,,(),,,,,,,,,21,?;,,,,,,,,,,,(1),(2),,(3),,,,,,31,?,,,,,,,()11,,,:=-(1)=-(2):=-(+)35©1995-2003TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.=(-)-=-(3),,,,:=+=-=,=-=0(4),,:=-(1+)=0(5),:=-(1+)0(6),,21,,(),,:,,:==r()r()(7)=r,,:=(-)=(8),,,:=-=(/-1)(9)=(/)=,,;,,,,:=-=(/-/)=(-)(10),,,,,;,,(),:;;,;,,4519988177©1995-2003TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.,,,,(),,,,(),,:=+-(1-),,,,;,(),,,,,,,,:=:,,,,;,(),,,,,:=(-),,,,,,;,,,,[]11RichardBrealey,StewartMyers(1981),PrinciplesofCorporateFinance.21McGRAW-HILLINTERNATIONALBOOKCOMPANY.31:,,199741:,,199751:,,1997(11)(:)(:)55©1995-2003TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.