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高等数学(下)模拟 七 一. 填空题(每空 3 分,共 24 分) z 1 1.二元函数 (x2 y2 ) 25 x2 y2 的定义域为 21 2.一阶差分方程 yt1 3 yt 5 的通解为 3. z x y 的全微分 dz _ 4. ydx xdy 0 的通解为 ___ z arctan y z 5.设 x ,则 x ___ 6.微分方程 y 2y 5y 0 的通解...
A.基可行解的非零分量的个数不大于 mB.基本解的个数不会超过 Cmn 个 C.该 问题不会出现退化现象 D.基可行解的个数不超过基本解的个数 E.该问题的基 是一个 m×m 阶方阵 4.若线性规划问题的可行域是无界的,则该问题可能 ABCD A.无有限最优解 B.有有限最优解 C.有唯一最优解 D.有无穷多个最...