tim cac so nguyen x,y sao cho :xy+12=x+y
a, Tim cac so nguyen duong x,y nho hon 10 sao cho 3x - 4y = -21
b, tim cac so nguen x,y sao cho xy -2x + 5y -12 = 0
tim cac so nguyen x va y sao cho (x^2-x+1)(y^2+xy)=3x-1
Tim tat ca cac cap so nguyen x,y sao cho xy-2x+y+1=0
xy-2x+y+1=0
x(y-2)+y+1=0
x(y-2)+y=-1
x(y-2)+(y-2)=-1-2
x(y-2)+(y-2).1=-3
(y-2).(x+1)=-3
y-2 E Ư(-3)
y-2 E(1;-1;3;-3)
ta có bảng
y-2 1|-1|3|-3|
x+1 -3|3|-1|1|
y 3|1|5|-1|
x -4|2|-2|0|
vậy các cặp(x;y) là(3;-4);(1;2);(5;-2);(-1;0)
mình làm sai thì thôi bạn nhé=)
BAI 1 : TIM TAT CA CAC SO TU NHIEN x , y SAO CHO : ( 2x + 1 ) . ( y - 5 ) = 12
BAI 2: a ) TIM SO NGUYEN x VA y, BIET : xy - x + 2y = 3
b) CO SO TU NHIEN NAO MA CHIA CHO 18 DU 12 , CON CHIA CHO 6 THI DU 2 KHONG ?
tim tat ca cac cap so x;y sao cho x^2-2/xy+2 co gia tri nguyen
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 so nguyen x y sao cho (2x+1).(y-1)=12
tim cac so nguyen to x va y sao cho cac so 5x+y va xy+13 cung la so nguyen to
giai nhanh giup minh nha mai minh phai nop roi
tim tat ca cac cap so nguyen x, y sao cho : xy - 2x + y + 1 = 0
xy-2x+y+1=0
=>xy-2x+y=-1
=>x.(y-2)+y=-1
=>x.(y-2)+y-2=-1-2
=>(y-2).(x+1)=-3
=>y-2,x+1thuộc Ư(-3)={1;-1;3;-3}
y-2 | 1 -1 3 -3 |
x+1 | 3 -3 1 -1 |
y | 3 1 5 -1 |
x | 2 -4 0 -2 |
vậy x=2;y=3
x=-4;y=1
x=0; y=5
x=-2;y=-1
xy-2x+y+1=0
=>xy-2x+y=-1
=>x.(y-2)+y=-1
=>x.(y-2)+y-2=-1-2
=>(y-2).(x+1)=-3
=>y-2,x+1thuộc Ư(-3)={1;-1;3;-3}
y-2 | 1 -1 3 -3 |
x+1 | 3 -3 1 -1 |
y | 3 1 5 -1 |
x | 2 -4 0 -2 |
vậy x=2;y=3
x=-4;y=1
x=0; y=5
x=-2;y=-1