ta có x^2-y^2=5
suy ra (x-y).(x+y) =5
suy ra x-y và x+y thuộc Ư(5)={1;5;-1;-5}
ta có bảng giá trị
x-y 1 5 -1 -5
x+y 5 1 -5 -1
x 3 3 -3 -3
y 2 -2 -2 2
chọn /loại C C C C
tim cap so nguyen X,Y biet 8x(2009-x)^2=25-y^2
tim x,y biet 5x^2 -2xy+ 2y^2=18 ; x,y la so nguyen
tim cac so nguyen x,y biet x^2-(y-3)x-2y-1=0
tim so nguyen x,y biet 3/x+y/5=11/6
1 tim cac so nguyen x,y biet x/7=6/21 -5/y=20/28 1/2=x/12 x/8=-28/32 3/y=12/24 3/4=15/y 2 viet 3 phan so bang phan so -10/15
Tim x, y nguyen biet: 5-y^2= 4(x-2016)^2
Tim so nguyen x,y biet:
(x+1)^2+(y-1)^2=0
tim x ,y la so nguyen to biet : x^2 - 6y^2 -1 =0
tim so nguyen x,y biet 5/x+y/4=1/8
