两个方程式只在Y项的定义上有差别，但是这个差别将使估算结果产生很大不同。
The two equations differ only in the definition of the Y term, but this difference can make a significant difference in the outcome of an estimate.
这个方程式应该明确的定义决策变量、约束条件和目标函数。
The mathematical formulations should clearly define the decision variables, the constraints, and the objective function.
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