tim so nguyen p sao cho p^2=1 va p^4+1 cung la so nguyen to. tra loi so nguyen to thoa man la p=
tim tat ca cac so nguyen to a,b,c co the bang nhau thoa man abc<ab+bc+ca chung minh rang neu b la so nguyen to >3 thi (b+1)(b-1) chia het cho 24
tim x nguyen biet |x^2-2|+|2-x^2|=28. tim cac gia tri nguyen cua x thoa man la
tim 3 so nguyen a,b,c thoa man :
a + b = -4 ; b + c = -6 ; c + a = 12
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.
cho a.b la 2 so nguyen to khong cung nhau thoa man a=2n+3;b=3n+1. khi do UCLN(a,b) bang
Cho a, b la 2 so tu nhiên không nguyen to cung nhau va thoa man a=4n+3,b=5n+1(n thuoc N). Tìm UCLN(a, b)
tim so nguyen x thoa man -210=-1+-2+-3+...+(-x-1)+-x la
tim cap a;b nguyen sao cho a,b lon nhat thoa man (a+1).(b+2)=3
