tim cac cap so nguyen duong nguyen to cung nhau sao cho: (x+y)/(x^2+y^2)=7/25
mk can gap lam
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 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
tim cap so nguyen X,Y biet 8x(2009-x)^2=25-y^2
tim cac so nguyen to x,y sao cho x^2-2y^2-1=0 GIUP MINH VOI
