i_am_sone New member Xu 0 21/1/11 #1 Cho \[x, y, z , t \] thỏa mãn : \[x, y, z, t >0\]. Tìm min của: \[A= \frac{x-1}{t+y} + \frac{1-y}{y+z} +\frac{y-z}{z+t} + \frac{z-x}{x+t}\] :66::98:
Cho \[x, y, z , t \] thỏa mãn : \[x, y, z, t >0\]. Tìm min của: \[A= \frac{x-1}{t+y} + \frac{1-y}{y+z} +\frac{y-z}{z+t} + \frac{z-x}{x+t}\] :66::98:
bomkute1996th New member Xu 0 22/1/11 #2 Bai nay de ma.chi can cong them 4 vao ca 2 ve.ban viet nham de roi 1 phai thay bang t