已知实数x,y满足x+y>=2,x-y
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已知实数x,y满足x+y>=2,x-y已知实数x,y满足x+y>=2,x-y已知实数x,y满足x+y>=2,x-y见图. 满足三个条件的是以A(2, 0), B(-1,&
已知实数x,y满足x+y>=2,x-y
已知实数x,y满足x+y>=2,x-y
已知实数x,y满足x+y>=2,x-y
见图. 满足三个条件的是以A(2, 0), B(-1, 3), C(5, 3)为顶点的三角形（含边和顶点）
z = 2x + y在x = -1, y = 3时取最小值1
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