求翻译：该方程式表明，工程项目的不同完工时间所对应的活动总费用和工程项目所需要的总费用随着时间的变化而变化。假设当 t = T 时，Y= Min(Y) 即工程总费用达到最低点，我们将T点称为最低成本日程（我们可以用一阶导数为零，二阶导数为正来求得T点）。是什么意思？

The equation, the total cost of projects completed in time corresponding to the total cost and project needs change over time. Suppose that when t = t, y = min (y), the total cost reached its lowest point, we have t point as the lowest cost schedule (we can use the first derivative is zero, the seco

This equation suggests that the different projects, completion time for the total costs and the need to project the total cost of the change over time. Assume that when T = T, Y = Min (Y) that is lowest total cost of the project, we will be T is referred to as the minimum cost schedule (we can use a

This equation indicated, the engineering project different completion time corresponds the active total expense and the engineering project needs the total expense changes along with the time change.When supposition t = T, Y= Min(Y) is the project total expense achieves the perigee, we T are called

The equation shows that, different activities corresponding to the time of completion of the project total costs and total cost of the project required changes as time changes. Suppose when you t=T, Y=Min (Y) total project cost reached its lowest point, we call t a minimum-cost schedule (we can use

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