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200 × x1 + 250 × x2 + 190 × x3 + 180 × x4 + 220 × x5 + 230 × x6 £ 800
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xxx f ( x) = 0.15 × x1 + 0.30 × x2 + 0.02 × x3
2.2 × x1 + 0.5 × x2 + 3.5 × x3 £ 500
x1 ³ 50
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