cho x+y=2x^5
va x^4+x^2y^2+y^4=xy(x^2+y^2)+1 tim x va y
Tim x,y biet ;\(x+y+12=4\sqrt{x}+6\sqrt{y-1}\)
1 tim MAX cua (x+z)(y+t) biet x^2+y^2+z^2+t^2=1
2 tim MAX cua (x+z)(y+t) biet x^2+y^2+2z^2+2t^2=1
1 tim gia tri lon nhat cua (x+z)(y+t) biet x^2+y^z^2+t^2=1
2 tim gia tri lon nhat cua (x+z)(y+t) biet x^2+y^2+2z^2+2t^2=1
cho x,y>0 va x+y < hoặc =1 tim GTNN x/(1+y) + y/(1+x) + 1/(x+y)
10 tk nha !!!!
Tim x,y biet:2xy^2+x+y+1=x^2+2y^2+xy
Cho x,y>0 va x+y=1.tim GTNN A= 1/(x^2+y^2) +1/xy
tim so tu nhien x;y biet ;2^x+1*3^y=36^x
tim x,y biet : x^2+y^2-2xy-4=0
