运筹学 通过计算机运算计算出来的结果有什么含义?

运筹学 通过计算机运算计算出来的结果有什么含义?
计算机计算结果：
Objective Function Value = 1219.091 Variable Value Reduced Costs
-------------- --------------- ------------------
X1 87.273 0.000
X2 19.091 0.000
X3 0.000 7.909
Constraint Slack/Surplus Dual Prices
-------------- --------------- ------------------
1 0.000 1.273 2 10.909 0.000
3 506.182 0.000
4 0.000 1.545
OBJECTIVE COEFFICIENT RANGES
Variable Lower Limit Current Value Upper Limit
------------ --------------- --------------- ---------------
X1 4.543 12.000 63.000
X2 1.714 9.000 30.000
X3 No Lower Limit 10.000 17.909
RIGHT HAND SIDE RANGES
Constraint Lower Limit Current Value Upper Limit
------------ --------------- --------------- ---------------
1 54.000 630.000 670.000
2 589.091 600.000 No Upper Limit
3 201.818 708.000 No Upper Limit
4 180.000 270.000 277.059
急求、各位亲、帮帮忙 实在头大.
各个部分都有什么含义? 求详解.