表2-1中给出某线性规划问题计算过程中的一个单纯形表,目标函数为max z=50x 1 +100x 2 ,约束条件为≤,表中x 3 、x 4 、x 5 为松弛变量,表中解的目标函数值为z=27500。 表2-1 x 1 x 2 x 3 x 4 x 5 x 1 a 1 0 1 0 -1 x 4 50 0 d -2 1 1 x 2 250 0 e f 0 1 c j -z j b c -50 0 -50 (1)求a~f的值; (2)表中给出的解是否为最优解。
【判断题】Different forms of foreshadowings can be used to achieve the desired effect, such as the recollections of the characters, the narrator's re-creation of earlier situations, or memories in the form of d...
【单选题】It is generally agreed that the first true cities appeared about 5,000 years ago in the food-producing communities of the Middle East. The cities of Sumeria,Egyptand the Indus Valley possessed a numbe...
A.
West European cities established their own urban traditions.
B.
West European cities grew directly out of those in the Middle East.
C.
West European and Middle East cities went through the same phases.
D.
Cities appeared earlier in the Middle East than inGreeceand Rome.
【简答题】The Islamic State group has claimed responsibility for a bomb and gun attack Thursday in Indonesia's capital. The attack left (1) ______ seven people dead, including a Canadian and an Indonesian. Twen...