x+xy+y=12
(x+1)(y+1)+1=12
(x+1)(y+1)=11
TH1: x+1=1 ; y+1=11
Suy ra x=0;y=10
TH2: x+1=11 ; y+1=1
Suy ra x=10;y=0
Vậy(x;y)=(0;10);(10:0)
x+xy+y=12
(x+1)(y+1)+1=12
(x+1)(y+1)=11
TH1: x+1=1 ; y+1=11
Suy ra x=0;y=10
TH2: x+1=11 ; y+1=1
Suy ra x=10;y=0
Vậy(x;y)=(0;10);(10:0)
Tim so nguyen x,y biet:
a, xy = 12 va x + y =7
b, xy = -20 va x-y = -9
c, xy = 24 va x + y = -11
Xy+12 = x+y tim do tu nhien x,y
tim cac so nguyen x,y sao cho :xy+12=x+y
tim x y a,(x-1)(y+2)=7 b,x(y-3)=-12 c,xy+2x+2y=-16
Tim cac cap so nguyen x,y
a,x . ( y - 3 ) = -12
b,xy - 3x - y = 0
c,xy + 2x + 2y = -16
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
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 cac cap so mguyen x,y sao cho
(X-1)(y-3)=-7 xy+12=x+y
Tim giá trị x;y nguyên:
a. xy-3x-y=0
b. x+y+xy=3
c. x+6=y( x-1 )
d. xy=x+y+1992