数学--线性规划--题目已知点M(a,b),在由不等式{x≥0,y≥0,x+y≤2}所确定的平面区域内,那么点N(a+b,a-b)所在的平面区域的面积是多少?我自己有答案了:令u=x+y,t=x-y;那么x=(u+t)/2,y=(u-t)/2.不等式{x≥0,y
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![数学--线性规划--题目已知点M(a,b),在由不等式{x≥0,y≥0,x+y≤2}所确定的平面区域内,那么点N(a+b,a-b)所在的平面区域的面积是多少?我自己有答案了:令u=x+y,t=x-y;那么x=(u+t)/2,y=(u-t)/2.不等式{x≥0,y](/uploads/image/z/6177962-2-2.jpg?t=%E6%95%B0%E5%AD%A6--%E7%BA%BF%E6%80%A7%E8%A7%84%E5%88%92--%E9%A2%98%E7%9B%AE%E5%B7%B2%E7%9F%A5%E7%82%B9M%28a%2Cb%29%2C%E5%9C%A8%E7%94%B1%E4%B8%8D%E7%AD%89%E5%BC%8F%7Bx%E2%89%A50%2Cy%E2%89%A50%2Cx%2By%E2%89%A42%7D%E6%89%80%E7%A1%AE%E5%AE%9A%E7%9A%84%E5%B9%B3%E9%9D%A2%E5%8C%BA%E5%9F%9F%E5%86%85%2C%E9%82%A3%E4%B9%88%E7%82%B9N%28a%2Bb%2Ca-b%29%E6%89%80%E5%9C%A8%E7%9A%84%E5%B9%B3%E9%9D%A2%E5%8C%BA%E5%9F%9F%E7%9A%84%E9%9D%A2%E7%A7%AF%E6%98%AF%E5%A4%9A%E5%B0%91%3F%E6%88%91%E8%87%AA%E5%B7%B1%E6%9C%89%E7%AD%94%E6%A1%88%E4%BA%86%EF%BC%9A%E4%BB%A4u%3Dx%2By%2Ct%3Dx-y%3B%E9%82%A3%E4%B9%88x%3D%28u%2Bt%29%2F2%2Cy%3D%28u-t%29%2F2.%E4%B8%8D%E7%AD%89%E5%BC%8F%7Bx%E2%89%A50%2Cy)
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