Tim a va b sao cho a.b=280 va UCLN(a,b)=2740
Lam cu the nha cac ban
tim hai so a va b biet a.b=2250va UCLN(a,b)=15
tin 2 so a va b biet rang a.b=1176;BCNN(a,b)=84 va a>b
1.tim STN n sao cho 2n+3 chia het cho 2n-1
2.tim STN a va b biet a.b=48 va UCLN(a, b)=2
biet rang BCNN(a,b).UCLN(a,b)=a.b
a, tong cua hai so bang 60,tong giua UCLN va BCNN cua chung la 84 tim hai so do
tim hai so tu nhien a,b biet a.b=1994 va UCLN(a,b)=18
nho giai cu the ra nhe
tim 2 so a;b biet UCLN(a;b)=6 va a.b=864
tim 2 so a va b biet UCLN(a,b)= 3va a.b=4050
a, Cho ( a,b) = 1 . Chung minh rang (a.b, a+b)=1
b, Cho (a,b)= 1. Tim UCLN (11a+2b , 18a +5b)
C,, Cho A = m+n ; B=m^2+n^2.Trong do m va n la cac so tu nhien nguyen to cung nhau. Tim UCLN (A,B)
d, Tim cac so tu nhien n sao cho n^3 - n^2 + n-1la so nguyen to
