xy+x-y-1=1
=>x(y+1)-(y+1)=1
=>(y+1)(x-1)=1
=>\(y+1\inƯ\left(1\right)\Rightarrow y+1\in\){-1:1}
| y+1 | 1 | -1 |
| x-1 | 1 | -1 |
| y | 0 | -2 |
| x | 2 | 0 |
| kết luận | thỏa mãn | thỏa mãn |
vậy.......................
Tim cac gia tri nguyen cua x biet
a, Y=5x+9/ x+3
b, Tim cac cap so nguyen x , y thoa mai he thuc :
(2x-1).(y+4)
Cau 1: Co tat ca bao nhieu so co 3 chu so ma trong moi so co duy nhat 1 chu so 5.
Cau 2: Biet rang 3n+1 va 5n+4 (n thuoc N) la hai so khong nguyen to cung nhau. Khi do UCLN cua 3n+1 va 5n+4 la bao nhieu.
Cau 3: Tim cap (x;y) nguyen am thoa man:xy+3x+2y+6=0 va lxl+lyl=5.
tim cac so nguyen x,y,z thoa man dieu kien sau
x^2=y-1
y^2=z-1
z^2=x-1
1.Tim cac chu so x va y de so 1x8y2 chia het cho 36
2.tim cac gia tri nguyen cua n de phan so A=3.n+2/n-1 co gia tri la so nguyen
3.tim cac chu so x y thoa man
(x-2)^2.(x-3)^2=4
4.tim so tu nhien x biet
(x-5):3/100=20.x/100 +5
tim cac so nguyen to x,y thoa man:(x -2) nhan (y-3)=-4
tim cac so nguyen to x,y thoa man 272x= 11^y + 29
tim cac so nguyen to x, y thoa man: (x - 2)2(y - 3)= -4
Tim cac so nguyen x, y, z thoa man x/y +y/z+z/x =y/x+/y+x/z=x+y+z=3
Tim cac so nguyen x,y thoa man : xy+3x-y=8
