<=>x+y-xy=0
<=>x(1-y)-(1-y)+1=0
<=>(x-1)(1-y)=-1
Vì x,y thuộc Z nên ta cs bảng sau
| x-1 | 1 | -1 | ||
| 1-y | -1 | 1 | ||
| x | 2 | 0 | ||
| y | 2 | 0 |
k nha
Đúng 0
Bình luận (0)
Các câu hỏi tương tự
tim 2 so nguyen x va y sao cho
x.y=x-y(cach lam)
tim cac so nguyen x,y sao cho: x.y= -7 va x < y
tim cac so nguyen x,y sao cho x.y=-5
Tim x,y la so nguyen va x,y>0 sao cho:
1/x+1/y+1/x.y=1/2
tim so nguyen x, y thoa man : 3.x.y + x =2.y
tim so nguyen x, y thoa man : 3.x.y + x =2.y
tim so nguyen x , y thoa man : x - 2.x.y + 3.y = 1
tim cac cap so nguyen to x,y: x.y=2x+2y
tim x dua vao quan he uoc boi:tim so tu nhien x sao cho x-1 la uoc cua 12tim so tu nhien x sao cho 2x+1 la uoc cua 28tim so tu nhien x sao cho x+15 la boi cua x+3tim cac so nguyen x,y sao cho (x+1)(y-2)3tim so nguyen x sao cho(x+2).(y-1)2tim so nguyen to x vua la uoc cua 275 vua la uoc cua 180tim so nguyen to x,y biet x+y12 va UCLL (x:y)5tim so tu nhien x,y biet x+y32 va UCLL (x:y)8tim so tu nhien x biet x chia het cho10; xchia het cho12; x chia het cho15 va 100x150tim so x nho nhat khac 0b biet...
Đọc tiếp
tim x dua vao quan he uoc boi:
tim so tu nhien x sao cho x-1 la uoc cua 12
tim so tu nhien x sao cho 2x+1 la uoc cua 28
tim so tu nhien x sao cho x+15 la boi cua x+3
tim cac so nguyen x,y sao cho (x+1)(y-2)=3
tim so nguyen x sao cho(x+2).(y-1)=2
tim so nguyen to x vua la uoc cua 275 vua la uoc cua 180
tim so nguyen to x,y biet x+y=12 va UCLL (x:y)=5
tim so tu nhien x,y biet x+y=32 va UCLL (x:y)=8
tim so tu nhien x biet x chia het cho10; xchia het cho12; x chia het cho15 va 100<x<150
tim so x nho nhat khac 0b biet x chia het cho 24 va 30
40 chia het cho x . 56 chia het cho x va x>6