已知变量x,y满足3个不等式分别是x-4y+3<=0,3x+5y-25<=0,x>=1
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x-4y+3<=0......(1)
3x+5y-25<=0....(2)
x>=1...........(3)
5*(1)+4*(2)得:
17x-85<=0得x<=5
根据(3)得1=<x<=5....(4)
(1)+(2)得y<=22-4x...(5)
(4)与(5)得y<=2......(6)
(4)与(1)得y>=1......(7)
(6)与(7)得1<=y<=2...(8)
1、z=y/x的最小值为z=1/5
2、z=x^2+y^2的取值范围是:2<=z<=29
3x+5y-25<=0....(2)
x>=1...........(3)
5*(1)+4*(2)得:
17x-85<=0得x<=5
根据(3)得1=<x<=5....(4)
(1)+(2)得y<=22-4x...(5)
(4)与(5)得y<=2......(6)
(4)与(1)得y>=1......(7)
(6)与(7)得1<=y<=2...(8)
1、z=y/x的最小值为z=1/5
2、z=x^2+y^2的取值范围是:2<=z<=29
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都是高手的符合规范和好好地方就是快递费是几个号房间 大幅缓解
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x-4y+3<=0......(1)
3x+5y-25<=0....(2)
x>=1...........(3)
5*(1)+4*(2)得:
17x-85<=0得x<=5
根据(3)得1=<x<=5....(4)
(1)+(2)得y<=22-4x...(5)
(4)与(5)得y<=2......(6)
(4)与(1)得y>=1......(7)
(6)与(7)得1<=y<=2...(8)
1、z=y/x的最小值为z=1/5
2、z=x^2+y^2的取值范围是:2<=z<=29
3x+5y-25<=0....(2)
x>=1...........(3)
5*(1)+4*(2)得:
17x-85<=0得x<=5
根据(3)得1=<x<=5....(4)
(1)+(2)得y<=22-4x...(5)
(4)与(5)得y<=2......(6)
(4)与(1)得y>=1......(7)
(6)与(7)得1<=y<=2...(8)
1、z=y/x的最小值为z=1/5
2、z=x^2+y^2的取值范围是:2<=z<=29
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