xy-2x+y=15
<=.xy-2x+y-2=13
<=>x(y-2)+(y-2)=13
<=>(x+1)(y-2)-13=0
<=>(x+1)(y-2)-13=-13.1=13.(-1)
x+1 -13 1 13 -1
y-2 1 -13 -1 13
x -14 0 12 -2
y 3 -11 1 15
vậy pt có 4 nghiệm:
(1)x=-14 ; y=3
(2)x=0 ; y=-11
(3)x=12 ; y=1
(4)x=-2 ; y=15
Các câu hỏi tương tự
tim cac so nguyen x , y biet
c) (2x + 1)(y - 4)
d) x + y = 3 va x - y = 15
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
tim so nguyenx va y biet : xy-x+2y=3
tim x va y, biet:
xy - x + 2y = 3
a) tim so nguyen x sao cho : 4x+5 chia het cho 2x-1
b) tim so nguyen x va y biet : xy+3x-2y -11 = 0
giup mik nha ! ai nhanh nhat mik tick cho !
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
TIM X , Y BIET
a)X+XY+Y=9
b)XY-2X-3Y=5
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 ?
Bai 1 : Tim cac so nguyen x , y biet :
a, x +xy + y = 9
b, xy - 2x -3y = 5
c, xy - 2x + 5y = 2