皮皮学，免费搜题
登录
搜题
【简答题】
求二元函数z＝f(x，y)＝x2y(4－x－y)在由直线x＋y＝6、x轴和y轴所围成的闭区域D上的极值、最大值与最小值．
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】With an increasing elderly population, the demand for prescription drugs has gone up dramastically. This phenomenon is taking place in the __________ environment of business.
A.
economic
B.
social
C.
industry
D.
global
【简答题】Most people read short stories. Magazines, newspapers, and books, printed in millions of copies every month, regularly supply the demand for short fiction. In the United States today the short story i...
【单选题】照射量的国际单位是（ ）
A.
库仑·(千克)-1(C·kg-1)
B.
焦耳·(千克)-1(J·kg-1)
C.
戈瑞(Gy)
D.
希沃特(Sv)
E.
贝可勒尔(Bq)
【简答题】第 II 卷 ( 共 80 分 ) 补出下列名篇名句中的空缺部分。 (2) 为什么我的眼里常含泪水? ...... (艾 青 《我爱这 土地》 )( 2 分) 答案请不要写标点!!!
【单选题】Which of the following does not meet the demand for the storage of ofloxacin tablets according to the text?
A.
Below 25° C in a dry place
B.
Above 25° C in a dry place
C.
Protect from light
D.
Keep out of reach children
相关题目：