已知实数x,y满足{2x−y≥4x+2y≤4,y≤0则z=3x-2y的最小值是?
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1.已知实数x,y满足{2x−y≥4x+2y≤4,y≤0则z=3x-2y的最小值是?
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2.已知实数x,y满足 |2x y 1|≤|x 2y 2|,且-1≤y≤1,则z=2x y的最大值是______.
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3.已知实数x,y满足xy 1=2x y,且x>1,则(x 1)(y 2)的最小值为______.
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4.已知实数x,y,z满足x² y² z²=1,则2xy 2yz的最大值为
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5.已知实数x,y,满足:,
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6.已知实数x y满足-x 2 5/2x y-5 0
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7.已知实数x,y满足xy 1=4x y,且x>1,则(x 1)(y 2)的最小值为______.
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8.已知实数x,y满足约束条件{0≤y;0≤ x-y;0≤2x-y-2 }则z=y-1/x 1
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9.设x,y为实数,若4x2 y2 xy=1,则2x y的最小值是______.
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10.已知int x=10,y=20,z=30;语句if(x>y) z=x; x=y; y=z;执行之后x,y,z的值是( )