Ta có : 5xy - 3 = 2xy
=> 5xy - 2xy = 3
=> 3xy = 3
=> xy = 1
=> \(\hept{\begin{cases}x=1\\y=1\end{cases}}\)(vì \(x;y\inℕ\))
5xy - 3 = 2xy
5xy - 2xy = 3
(5 - 2).xy = 3
3 xy = 3
xy = 3 : 3
xy = 1 = 1.1 mà (x ; y)\(\inℕ\)
\(\Rightarrow\hept{\begin{cases}x=1\\y=1\end{cases}}\)
Vậy x = 1 ; y = 1
tim so tu nhien x,y thoa man : x^2 + 2xy = 100
tim cac so tu nhien x, y thoa man 2xy + x + y = 4
TIM CAC SO TU NHIEN x, y THOA MAN : x2 + 2xy = 100
Tim cac so tu nhien x ,y thoa man : x2 +2xy =100
tim so tu nhien n thoa man 3n=81
so tu nhien xy thoa man x phan 5 - 4 phan y=1phan 3
tim so tu nhien n thoa man:
1+2+3+4+....+ n = 420
tim so tu nhien n va chu so a thoa man 1+2+3+...+n=aaa gach dau
tim so tu nhien x thoa man : x<3^x
