xy - x + 2(y - 1) = 13
=> x.(y - 1) + 2.(y - 1) = 13
=> (y - 1).(x + 2) = 13
Ta có bảng sau:
x + 2 | 1 | -1 | 13 | -13
y - 1 | 13| -13| 1 | -1
x | -1| -3 | 11| -15
y | 14| -12| 2 | 0
Vậy các cặp số (x;y) nguyên thỏa mãn đề bài là: (-1;14) ; (-3;-12) ; (11;2) ; (-15;0)
tm cac cap so nguyen xy
y(x-1)=x2+2
Tim tat cac cac cap so nguyen x,y thoa man a) x^2+5xy+4y^2
b)xy-2x+3y-1
Tim tat cac cac cap so nguyen x,y thoa man a) x^2+5xy+4y^2
b)xy-2x+3y-1
Tim tat cac cac cap so nguyen x,y thoa man a) x^2+5xy+4y^2
b)xy-2x+3y-1
cap so nguyen duong x y thoa man x(x-2)-(2-x)y-2(x-2)=3
1.Tim cac cap so nguyen x,y sao cho x+y=2xy
2.Tim GTNN A = x2+3(x-1)2
tim cac cap so nguyen(x;y) thoa man; x^2+6xy=18 va x-2y=-7/2*y
tim cac cap so nguyen duong (x,y) thoa man phương trình 6x2 + 5y2 = 74
so cap so nguyen duong (x,y) de p nhan gia tri so nguyên P=\(\frac{3x+3y+5}{x+y}\)
