Vì (x-1)(3-y)=-7
=> \(\left(x-1\right)\left(3-y\right)\inƯ_7\)
Ta có bảng sau:
| x-1 | 1 | -7 | ||
| 3-y | -7 | 1 | ||
| x | 2 | -6 | ||
| y | 10 | 2 |
x,y nguyên => x-1; 3-y nguyên
=> x-1; 3-y \(\inƯ\left(-7\right)=\left\{-7;-1;1;7\right\}\)
Ta có bảng
| x-1 | -7 | -1 | 1 | 7 |
| x | -6 | 0 | 2 | 8 |
| 3-y | 1 | 7 | -7 | -1 |
| y | 2 | -4 | 10 | 4 |
Tim tat ca cac cap so nguyen x,y sao cho xy-2x+y+1=0
Tim tat ca cac cap so nguyen x,y sao cho
a) xy = 3
b) x(2y - 1)=8
Tim tat ca cac cap so nguyen x,y sao cho
c) (x - 2) (2y + 1)=4
tim tat ca cac cap so nguyen x, y sao cho : xy - 2x + y + 1 = 0
tim tat ca cac cap so tu nhien (X,Y) sao cho 34X5Y chia het cho 36
Tim tat ca cac cap so nguyen x,y sao cho
a) xy-2x-2y=0
b) 20x + 10y =2010
1.a, cho a=3+3^2+3^3+3^4+...+3^90. chung minh rang achia het cho 11 vs 13
b, tim tat ca cac cap so nguyen x,y sao cho x.y-2x+y+1=0
minh dang can gap nhanh len cac ban@gmail.cm
tim tat ca cac so nguyen duong x,y sao cho cac so x2+3.y va y2+3.x deu la so chinh phuong cua 1 so
Cau1 Tim cac chu so x, y sao cho so co 4 chu so 4x7 y chua het cho tat ca cac so 2,3,5
Cau 2 :Tim x la so tu nhien be nhat sao cho x > 10,35
Cau 3 : Tim x la so tu nhien lon nhat sao cho x < 8,2
