=>x.y=8 ,mà x,y nguyên =>x,y thuộc Ư(8)={1;2;4;8;-1;-2;-4;-8}
ta có 8 cặp số (x,y) là (1;8) (2,4) (-1,-8) (-2;-4) và 4 cặp ngược lại
xin loi nhg lam on trinh bay ro ra cho mjnk
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 la so nguyen thoa man 1/x +1/y=1/8
tim x va y la so nguyen to ma x^2=8.y+1 . SKT_TT giups to
Tim x, y, p ( p la so nguyen to) biet
1/x+1/y=1/p
Tim x,y la so nguyen va x,y>0 sao cho:
1/x+1/y+1/x.y=1/2
tim x,y,z la cac so nguyen
a) x-y=0,y+2z=1
b) x+y+z=7
Bai 1: Tim x va y
a) ( x+ 5) .( x-3) = 15
b)( 2x -1).(y + 2) =24
c)x.y+y+x =30
d) 3x.y+2x +2y=0
Bài 2: tìm các số nguyên tố P
a) de P +2;P+94 cung la so nguyen to
b) de P+6;P+8;P+12;P+14 cung la so nguyen to
