题目:1. George needs to find at least 12 lb of gold and at least 18 lb of silver to pay the monthly rent. There are 2 mines in which George can find gold and silver.Each day that George spends in mine 1 ,he finds 2 lb of gold and 2 lb of silver. Each day that George spend in mine 2 ,he finds 1 lb of gold and 3 lb of silver. Formulate an LP to help George meet his requirements while spending as little time as possible in the mines. Graphically solve the LP. 2.You blend silicon and nitrogen to produce 2types of fertilizers. Fertilizer 1 must be at least 40% nitrogen and sells for $70/lb Fertilizer 2 must be at least 70% silicon and sells for $40/lb. You can purchase up to 80 lb of nitrogen at $15/lb and up to 100 lb of silicon at $10/lb . Assuming that all fertilizer preduced can be sold, formulate an LP to help you maximize profits. 以上的2个问题要如何设限制式? 请大家帮帮忙 我们会感激在心的 谢谢............ ps.要特别谢谢之前帮我们解答线性问题的人 感谢你 --

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