若实数xy满足y≤2x+3,且y=x^2,则y/(x-12)的取值范围是
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若实数xy满足y≤2x+3,且y=x^2,则y/(x-12)的取值范围是
若实数xy满足y≤2x+3,且y=x^2,则y/(x-12)的取值范围是
若实数xy满足y≤2x+3,且y=x^2,则y/(x-12)的取值范围是
此题为线性规划问题.在直角坐标内做出y≤2x+3且y=x^2的区域.y/(x-12)表示区域内的点到点〔12,0〕的斜率,找出边界点是〔0,0〕和〔3,9〕,所以y/(x-12)的取值范围是大于等于-1小于等于0.
x^2≤2x+3
x^2-2x-3≤0
-3≤x≤3,0≤y≤9
-1≤y/(x-12)≤0
-1小于等于y/(x-12)小于等于0
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若实数xy满足y≤2x+3,且y=x^2,则y/(x-12)的取值范围是
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