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x^2+(y-1)^2+(x-y)^2 =(-x)^2+(y-1)^2+(x-y)^2
歌西不等式 [(-x)^2+(y-1)^2+(x-y)^2] *(1^2+1^2+1^2) >= [(-x)*1+(y-1)*1+(x-y)*1]^2=1
=>x^2+(y-1)^2+(x-y)^2 >= 1/3 已知等号成立 => -x :1 = (y-1) :1 =(x-y):1
=>y-1=-x & x-y=y-1 => x=1-y ; x=2y-1 => 1-y=2y-1 => 3y=2 => y=2/3 => x=1/3
=> x+y = 1/3 +2/3 =1....ans
歌西不等式 [(-x)^2+(y-1)^2+(x-y)^2] *(1^2+1^2+1^2) >= [(-x)*1+(y-1)*1+(x-y)*1]^2=1
=>x^2+(y-1)^2+(x-y)^2 >= 1/3 已知等号成立 => -x :1 = (y-1) :1 =(x-y):1
=>y-1=-x & x-y=y-1 => x=1-y ; x=2y-1 => 1-y=2y-1 => 3y=2 => y=2/3 => x=1/3
=> x+y = 1/3 +2/3 =1....ans
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x^2+(y-1)^2+(x-y)^2=1/3
求X的导数:
2x+2(x-y)=0
2x=y
设x+y=m
x=(1/3)m
y=(2/3)m
代入原始式子得到:
m^2-2m+1=0
m=1
求X的导数:
2x+2(x-y)=0
2x=y
设x+y=m
x=(1/3)m
y=(2/3)m
代入原始式子得到:
m^2-2m+1=0
m=1
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