如图,求不等式最大值,
1个回答
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x+0.5y<=250...........(1)
0.5x+y<=250...........(2)
x+y<=300................(3)
x>=0..........................(4)
y>=0..........................(5)
取等号时,各直线两两交点有:
(1)(2):A(500/3,500/3)
(1)(3):B(200,100)
(1)(4):C(0,500)
(1)(5):D(250,0)
(2)(3):E(100,200)
(2)(4):F(0,250)
(2)(5):G(500,0)
(3)(4):H(0,300)
(3)(5):I(300,0)
(4)(5):O(0,0)
z=5x+3y
我们可先画一条5x+3y=0的直线,然后作5x+3y=0的平行线z=5x+3y,可以发现:平行线过G(500,0)时z取得最大值:zmax=5×500+3×0=2500
0.5x+y<=250...........(2)
x+y<=300................(3)
x>=0..........................(4)
y>=0..........................(5)
取等号时,各直线两两交点有:
(1)(2):A(500/3,500/3)
(1)(3):B(200,100)
(1)(4):C(0,500)
(1)(5):D(250,0)
(2)(3):E(100,200)
(2)(4):F(0,250)
(2)(5):G(500,0)
(3)(4):H(0,300)
(3)(5):I(300,0)
(4)(5):O(0,0)
z=5x+3y
我们可先画一条5x+3y=0的直线,然后作5x+3y=0的平行线z=5x+3y,可以发现:平行线过G(500,0)时z取得最大值:zmax=5×500+3×0=2500
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