运用运筹学有关知识及Lindo软件，对投资者经常会遇到投资项目的不同组合而造成利润不同的情况。投资者要根据投资项目的年收益-The use of operational research relevant knowledge and Lindo software, investors often encounter different combinations of investment projects, caused by the different circumstances of profits. Investors to invest in the project according to the annual earnings