一条高中有关线性规划的数学题目、在线等!在平面直角坐标系xoy中,集合M={(x,y)|x+y≤1,且x≥0,y≥0},N={(x-y,x+y)|(x,y)∈M}则当(x,y)∈N时,z=x-2y的最大值是多少?我的答案算的是3/2,但是答案是0,我觉得
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![一条高中有关线性规划的数学题目、在线等!在平面直角坐标系xoy中,集合M={(x,y)|x+y≤1,且x≥0,y≥0},N={(x-y,x+y)|(x,y)∈M}则当(x,y)∈N时,z=x-2y的最大值是多少?我的答案算的是3/2,但是答案是0,我觉得](/uploads/image/z/6786282-66-2.jpg?t=%E4%B8%80%E6%9D%A1%E9%AB%98%E4%B8%AD%E6%9C%89%E5%85%B3%E7%BA%BF%E6%80%A7%E8%A7%84%E5%88%92%E7%9A%84%E6%95%B0%E5%AD%A6%E9%A2%98%E7%9B%AE%E3%80%81%E5%9C%A8%E7%BA%BF%E7%AD%89%21%E5%9C%A8%E5%B9%B3%E9%9D%A2%E7%9B%B4%E8%A7%92%E5%9D%90%E6%A0%87%E7%B3%BBxoy%E4%B8%AD%2C%E9%9B%86%E5%90%88M%3D%7B%28x%2Cy%29%7Cx%2By%E2%89%A41%2C%E4%B8%94x%E2%89%A50%2Cy%E2%89%A50%7D%2CN%3D%7B%28x-y%2Cx%2By%29%7C%28x%2Cy%29%E2%88%88M%7D%E5%88%99%E5%BD%93%28x%2Cy%29%E2%88%88N%E6%97%B6%2Cz%3Dx-2y%E7%9A%84%E6%9C%80%E5%A4%A7%E5%80%BC%E6%98%AF%E5%A4%9A%E5%B0%91%3F%E6%88%91%E7%9A%84%E7%AD%94%E6%A1%88%E7%AE%97%E7%9A%84%E6%98%AF3%2F2%2C%E4%BD%86%E6%98%AF%E7%AD%94%E6%A1%88%E6%98%AF0%2C%E6%88%91%E8%A7%89%E5%BE%97)
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