设x，y满足约束条件，则目标函数的最大值为___________．
Simon， let's meet （在……外面）the theatre at 2 o'clock．
The （礼貌的）you are， the more others will like you．
Being healthy means keeping everything （好）balanced．
Cooking is one of David's （爱好）．
Guangzhou， a modern and developed city， is in the （south）part of China．
，则目标函数
的最大值为___________．
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