Tim cac so nguyen thoa man (x+y)^2=(x-1)(y+1)
tim cac so nguyen x ,y,z thoa man /x-y/+/y-z/+/z-x/=2015
Tim cac so nguyen duong x;y;z thoa man x!+y!=10.z+9
tim cac so nguyen to x,y thoa man 100x+39y=2017
tim cac so nguyen to x y z thoa man 3(x+y+z)=xyz
tim cac cap so nguyen x , y thoa man : 2 . ( xy - 3 ) = x
tim tat ca cac cap so nguyen x,y thoa man 2^x+1.3^y=12^x
tim cac so x,y thoa man :2x^2+y^2-2y=2(xy-1)
tim cac so huu ti x y thoa man x+y va 1/x +1/y nguyen duong
