Bài 17 :
a) Biểu diễn miền nghiệm của hệ bất phương trình:
x+y≤53x+2y≤12x               ≥1              y≥0">x+y≤53x+2y≤12x               ≥1              y≥0">x+y≤53x+2y≤12x               ≥1              y≥0">x+y≤53x+2y≤12x               ≥1              y≥0">x+y≤53x+2y≤12x               ≥1              y≥0">x+y≤53x+2y≤12x               ≥1              y≥0">x+y≤53x+2y≤12x               ≥1              y≥0">x+y≤53x+2y≤12x               ≥1              y≥0">x+y≤53x+2y≤12x               ≥1              y≥0">x+y≤53x+2y≤12x               ≥1              y≥0">x x+y≤53x+2y≤12x               ≥1              y≥0">+ x+y≤53x+2y≤12x               ≥1              y≥0">y x+y≤53x+2y≤12x               ≥1              y≥0">≤ x+y≤53x+2y≤12x               ≥1              y≥0">5
x+y≤53x+2y≤12x               ≥1              y≥0">x+y≤53x+2y≤12x               ≥1              y≥0">x+y≤53x+2y≤12x               ≥1              y≥0">x+y≤53x+2y≤12x               ≥1              y≥0">x+y≤53x+2y≤12x               ≥1              y≥0">x+y≤53x+2y≤12x               ≥1              y≥0">x+y≤53x+2y≤12x               ≥1              y≥0">x+y≤53x+2y≤12x               ≥1              y≥0">x+y≤53x+2y≤12x               ≥1              y≥0">3x+y≤53x+2y≤12x               ≥1              y≥0">x x+y≤53x+2y≤12x               ≥1              y≥0">+ x+y≤53x+2y≤12x               ≥1              y≥0">2x+y≤53x+2y≤12x               ≥1              y≥0">y x+y≤53x+2y≤12x               ≥1              y≥0">≤ x+y≤53x+2y≤12x               ≥1              y≥0">12
x+y≤53x+2y≤12x               ≥1              y≥0">x+y≤53x+2y≤12x               ≥1              y≥0">x+y≤53x+2y≤12x               ≥1              y≥0">x+y≤53x+2y≤12x               ≥1              y≥0">x+y≤53x+2y≤12x               ≥1              y≥0">x+y≤53x+2y≤12x               ≥1              y≥0">x+y≤53x+2y≤12x               ≥1              y≥0">x+y≤53x+2y≤12x               ≥1              y≥0">x+y≤53x+2y≤12x               ≥1              y≥0">x x+y≤53x+2y≤12x               ≥1              y≥0">≥ x+y≤53x+2y≤12x               ≥1              y≥0">1
x+y≤53x+2y≤12x               ≥1              y≥0">x+y≤53x+2y≤12x               ≥1              y≥0">x+y≤53x+2y≤12x               ≥1              y≥0">x+y≤53x+2y≤12x               ≥1              y≥0">x+y≤53x+2y≤12x               ≥1              y≥0">x+y≤53x+2y≤12x               ≥1              y≥0">x+y≤53x+2y≤12x               ≥1              y≥0">x+y≤53x+2y≤12x               ≥1              y≥0">x+y≤53x+2y≤12x               ≥1              y≥0">x+y≤53x+2y≤12x               ≥1              y≥0">y x+y≤53x+2y≤12x               ≥1              y≥0">≥ x+y≤53x+2y≤12x               ≥1              y≥0">0
x+y≤53x+2y≤12x               ≥1              y≥0">x+y≤53x+2y≤12x               ≥1              y≥0">b) Tìm x, y là nghiệm của hệ bất phương trình (III) sao cho F = 3x + 7y đạt giá trị lớn nhất, giá trị nhỏ nhất.
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