so cap so nguyen duong (a;b) thoa man a+2b=11 la

tim cac cap so nguyen duong nguyen to cung nhau sao cho: (x+y)/(x^2+y^2)=7/25

Co bao nhieu cap so nguyen duong (m,n) thoa cac dieu kien sau: 5n+3m=2015

Co bao nhieu cap so nguyen duong m,n thoa cac dieu kien sau:5m+3n=2015

cap so nguyen duong x;y thoa man |(x²+2).(y+1)| =9 

tim cac cap so nguyen duong nguyen to cung nhau sao cho: (x+y)/(x^2+y^2)=7/25

mk can gap lam

cap so nguyen duong x y thoa man x(x-2)-(2-x)y-2(x-2)=3

cap cac so nguyen duong( x;y) tm |(x^2+2)*(y+1)|=9 la x;y bang...

so  cap so nguyen duong  (x,y) de p nhan gia tri so nguyên P=\(\frac{3x+3y+5}{x+y}\)