tim tat ca cac so nguyen duong x,y sao cho cac so x^2+3.y va y^2+3.x deu la so chinh phuong cua 1 so

biet x,y,m,n la cac so nguyen thoa man: x+y=m+n. chung minh S=x^2+y^2+m^2+n^2 luon =bang cac binh phuong cua 3 so nguyen

cho x,y,z la cac so huu ti duong thoa man x+1/yz   y +1/xz  z+1/xy la cac so nguyen  tim gia tri lon nhat cua bieu thuc A=x+y^2+z^3

tim tat ca cac nghiem nguyen (x, y) cua phuong trinh x*3+y*3=(x+y)²

tim cac cap so nguyen ( x ; y ) thoa man : xy - x - y = 2

tim tat ca cac nghiem nguyen (x, y) cua phuong trinh x*3+y*3=(x+y)²

tim cac so nguyen x va y sao cho (x^2-x+1)(y^2+xy)=3x-1

giai ho minh voi minh can gap lam ai tra loi minh tich cho

1 tim cac so nguyen x thoa man 1 trong cac dieu kien sau

a) 2x+1 la scp

b) 4x=1 la scp 

c)8x+1 la scp

2 tim nguyen tu nhien cua phuong trinh x^2-y^2=y+1

tim cac so nguyen x,y

a) xy-2x+y=5

b) x^2-xy+x-y=6

c) (x+2)^2+2(y-3)^2<4