tim so nguyen x, y thoa man : 3.x.y + x =2.y

tim so nguyen x, y thoa man : 3.x.y + x =2.y

tim x, y nguyen thoa man : 3.x.y + x = 2.y

tim so nguyen duong x,y thoa man : x^2=1!+2!+3!+....+y!

a)Tim cap (x,y) nguyen duong thoa man xy=3(y-x)

b)cho 2 so x,y >0 thoa man x+y = 1

Tim GTNN cua M=(x^2+1/y^2)(y^2+1/x^2)  

tim cap so nguyen (x;y) thoa man : |x+2| + (y+2)2 = 3 - |x+1|

bai 1 28(30-48)-30(28-38)

bai 2 :tim cac cap so nguyen (x:y)thoa man : y+3+x.y+3x=7

Tim cac so nguyen thoa man (x+y)^2=(x-1)(y+1)

a)Tim tat ca cac so nguyen duong x, y , z thoa man: \(\frac{x+y\sqrt{2013}}{y+z\sqrt{2013}}\)la so huu ti, dong thoi x² + y²+ z² la so nguyen to.

b) Tim so tu nhien x, y thoa man: x(1+x+x²) = y(y-1).