Ta có:
3=1.3=(-1).(-3)=3.1=(-3).(-1)
Ta có bảng sau:
| x+1 | 1 | -1 | 3 | -3 |
| y+2 | 3 | -3 | 1 | -1 |
| x | 0 | -2 | 2 | -4 |
| y | 1 | -5 | -1 | -3 |
Vậy ta có các cặp (x;y) thỏa mãn là: (x;y)=(0;1);(-2;-5);(2;-1);(-4;-3)
1. tim cac cap so nguyen duong (x, y) sao cho:
2 x3 + xy = 11
2. tim cac cap so nguyen duong (x, y, z)sao cho:
x + y + z = x*y*z
3. tim x thuoc z, biet;
|x| = -2003
|x| = |-2003|
minh dang can gap lam. chieu mai phai nop rui
tim cac cap so nguyen (x,y)biet:
xy+3y+x=2
Tim cac cap so nguyen x,y thoa man
a) xy-5x+y=17
b) x.(y-2)=3 va x>y
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 cac cap so nguyen x,y
a,x . ( y - 3 ) = -12
b,xy - 3x - y = 0
c,xy + 2x + 2y = -16
tim cac cap so nguyen x,y
5x + 2y - xy = 16
tim tat ca cac cap so nguyen x, y sao cho : xy - 2x + y + 1 = 0
Tim cac cap x;y thoa man:
a) (x-3).(2.y+1)=5
b) xy+3x-7y=21
c) xy+3x-2y=11
