x+y>0 y-3《0,x-y-1《0,则根号(x^2+y^2)的max是?
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![x+y>0 y-3《0,x-y-1《0,则根号(x^2+y^2)的max是?](/uploads/image/z/14126256-0-6.jpg?t=x%2By%3E0+y-3%E3%80%8A0%2Cx-y-1%E3%80%8A0%2C%E5%88%99%E6%A0%B9%E5%8F%B7%EF%BC%88x%5E2%2By%5E2%29%E7%9A%84max%E6%98%AF%3F)
x+y>0 y-3《0,x-y-1《0,则根号(x^2+y^2)的max是?
x+y>0 y-3《0,x-y-1《0,则根号(x^2+y^2)的max是?
x+y>0 y-3《0,x-y-1《0,则根号(x^2+y^2)的max是?
求√(x^2 + y^2)的最大值
√(x^2 + y^2)=√[(x-0)^2 + (y-0)^2]
即(x,y)到(0,0)距离的最大值
x+y>0 y-3《0,x-y-1《0
作图,线性回归
易知,直线x-y-1=0与y=3的交点是x,y两个值最大的时候,交点为(4,3)
则√(x^2 + y^2)最大值为5
y-3<0,y<3
x+y>0
x-y-1<0
-y