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通过对黑龙江垦区二龙山农场５８台ДＴ－７５拖拉机１９９１～１９９５年运用情况实地调查，采用数理统计原理与方法，运用微机辅助分析手段，分别得出了该型拖拉机有关经济指标随机龄变化规律。计算出了该机型在二垄山垦区集体承包经营体制下运用的经济寿命。为ДＴ－７５拖拉机的运用管理与及时更新提供了决策参考依据
Through the field survey of 58 sets of ДT-75 tractors from 1991 to 1995 in Erlongshan Farm of Heilongjiang Reclamation Area, using mathematical statistics principles and methods, using computer-aided analysis, the random variation rules of the economic indicators of this tractor were obtained. Calculated the economic life of the model under the system of collective contract management in Er Ridges reclamation area. For ДT-75 tractor management and timely update provides a reference for decision-making