Bài 14 :Giá trị nhỏ nhất của biểu thức F = – x + y trên miền nghiệm của hệ bất phương...

Bài 14 : Giá trị nhỏ nhất của biểu thức F = – x + y trên miền nghiệm của hệ bất phương trình 

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A. 0.

B. 1.

C. 2.

D. 3.