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cho m va n la cac so tu nhien , m la so tu nhien le.Chung to rang m va mn+8la hai so nguyen to cung nhau.
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bai 1 tim so tu nhien co 4 chu so ab cd biet abcd+abc+ab+a=4321.tim abcd
bai 2 cho m , n la cac so tu nhien va p la so nguyen to thoa man 9/m-1=m+n/p. tinh A= p^2-n
bai 3 tim so co 3 chu so biet abc 1000/a+b+c=abc.
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
voi n so tu nhien thoa man 6n+1 va 7n-1 la hai so tu nhien khong nguyen to cung nhau thi uoc chung lon nhat cua 6n+1 va 7n-1 la bao nhieu
chung to rang hai so 3n+4 va n+1 la hai so nguyen to cung nhau voi n la so tu nhien khac 0
Cau hoi 1: Chu so tan cung cua 20092008
Cau hoi 2:So tu nhien a va b biet a>b va a+b va a.b la so nguyen to
Cau hoi 3:So phan tu cua tap hop N, {n thuoc tap hop N thoa mman dieu kien 60 chia het cho n}
Cau hoi 4:Chu so tan cung cua 71993
Bai nay minh ko hieu de ne.Ban giai thich va bay minh lam luon nhe:cho M la tap hop cac chu so le,so tap hop con cua M chi gom hai phan tu la?
Chung to rang:14n+3 va 21n+4 la so nguyen to cung nhau voi n la so tu nhien
CMR:co vo so so tu nhien n de n +15 va n+72 la hai so nguyen to cung nhau.
tim so tu nhien n de 2n+1 va 7n+2 la hai so nguyen to cung nhau