l`2x+1/2`l`+`l`y-1`l`=0`
vì l`2x+1/2`l `>=0 ∀ x ; `l`y-1`l` >=0 ∀ y `
`=> `l`2x + 1/2`l`+`l`y-1`l`>=0`
mà theo đề bài
l`2x + 1/2`l`+`l`y-1`l`=0`
`=> `l`2x + 1/2`l`=0 => 2x +1/2 = 0 => x = -1/4`
`=> `l`y-1`l`=0 => y-1 = 0 => y = 1 `
`vậy x=-1/4 ; y =1`
XIN 5 SAO VS HAY NHẤT AK