tim cac cap so nguyen duong nguyen to cung nhau sao cho: (x+y)/(x^2+y^2)=7/25
so cac cap so nguyen x,y thao man x+y+xy=3
can gap
1.Tim cac cap so nguyen x,y sao cho x+y=2xy
2.Tim GTNN A = x2+3(x-1)2
Tim cac cap so nguyen (x;y) sao cho 2x - 5y + 5xy =14
Tim cac cap so nguyen (x;y) sao cho 2x - 5y + 5xy =14
tim cac so nguyen duong x , y , z , t sao cho:
38(x.y.z.t+x.y+x.t+z.t+1)=49(y.z.t+y+t)
trinh bay cach lam cho minh voi nhe
tim tat ca cac cap so nguyen x,y sao cho2xy+x-2y=4
tim tat ca cac cap so nguyen x,y thoa man 2^x+1.3^y=12^x
tim cac cap so nguyen x , y thoa man : 2 . ( xy - 3 ) = x
