非线性规划 某厂向用户提供发动机 合同规定 第一 二 三季度末分别交货40台 60台 80台 讨论a b c变化对计划的影响 并作出合理的解释-Non-linear programming to provide users with a factory engine contract Hundred and Twenty delivery end of the quarter were 40 sets of 60 sets 80 sets abc discuss the impact of changes in the plan and make a reasonable explanation for