X.Y满足,2X-Y>=0.Y>=X.Y>=-X+B,且Z=2X+Y的最小值为3则B的值为多少rt
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![X.Y满足,2X-Y>=0.Y>=X.Y>=-X+B,且Z=2X+Y的最小值为3则B的值为多少rt](/uploads/image/z/5634235-19-5.jpg?t=X.Y%E6%BB%A1%E8%B6%B3%2C2X-Y%3E%3D0.Y%3E%3DX.Y%3E%3D-X%2BB%2C%E4%B8%94Z%3D2X%2BY%E7%9A%84%E6%9C%80%E5%B0%8F%E5%80%BC%E4%B8%BA3%E5%88%99B%E7%9A%84%E5%80%BC%E4%B8%BA%E5%A4%9A%E5%B0%91rt)
X.Y满足,2X-Y>=0.Y>=X.Y>=-X+B,且Z=2X+Y的最小值为3则B的值为多少rt
X.Y满足,2X-Y>=0.Y>=X.Y>=-X+B,且Z=2X+Y的最小值为3则B的值为多少
rt
X.Y满足,2X-Y>=0.Y>=X.Y>=-X+B,且Z=2X+Y的最小值为3则B的值为多少rt
Y≤2X,Y>=X,Y≥-X+B
则X≤Y≤2X
3X≤Z=2X+Y≤4X,Z=2X+Y的最小值为3
所以3X=3,X=1
所以1≤Y≤2
Y≥B-1=1
所以B=2
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
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