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tim cac so nguyen x,y biet:
2xy-6y+x=9
so sanh a.A=-9/10^2010+-19/10^2011va b= -9/10^2011+-19/10^2010 B.TIM SO Nguyen xy biet x^2+y^2+6y+5=0;2x^2+3y^2+4x=19
tim so nguyen to x y sao cho x^2-6y^2=1
1,tim cac so nguyen x,y biet: -2/x=y/3 va x<0<y
2, Tim cac so nguyen x,y biet:x-3/y-2=3/2 va x-y=4
a, Tim so tu nhien x, y biet rang 4<9/x<12/y<18
b, Tim so nguyen x, y biet rang x/2 - 2/y = 1/2
tim cac so nguyen x,y,z biet y^2=y-1; x^2=x-1; z^2=z-1
Tim cap so nguyen x,y biet :2.x+1/7=1/y
tim so nguyen x,y biet
x(xy+2)+y=1
tim so nguyen x, y biet :
x^2+(y-1)^2=25