试题与答案

一位农民有田2亩,根据他的经验:若种水稻,则每亩每期产量为400kg;若种花生,

题型:解答题

题目:

一位农民有田2亩,根据他的经验:若种水稻,则每亩每期产量为400kg;若种花生,则每亩每期产量为100kg,但水稻成本较高,每亩每期需240元,而花生只需80元,且花生每千克可卖5元,水稻每千克只卖3元.现在他只能凑足400元,问这位农民对两种作物各种多少亩,才能得到最大利润?

答案:

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(1)3(a+3)(a﹣3);(2)4x(2y﹣z);(3)﹣4(ax﹣1)2

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