5;7;11
7;11;13
.................................. v.v.v vo so
5;7;11
7;11;13
.................................. v.v.v vo so
tim tat ca cac bo 3 so nguyen to a,b,c
sao cho abc<ab+bc+ca
a,Tim cac so nguyen a,b sao cho a.b=-3
b,tinh tong cac so nguyen x biet: -6<x+2<8
c,tim tat ca cac U(-15)
Tim tat ca cac phan so co mau la 20, lon hon 3/13 va nho hon 5/13
tìm 3 số nguyên tố a, b, c sao cho a.b.c<a.b+b.c+c.a
tim tat ca cac phan so co mau so la 12 lon hon -2/3 va nho hon -1/4.
Tim tat ca cac so nguyen to p va q sao cho so 7p+q va pq+11 cung la cac so nguyen to
Tim tat ca cac so nguyen to p sao cho p+2 va p+28 cung la so nguyen to
tim tat ca cac so nguyen n sao cho 2n+3/7 la so nguyen
giupppppppppp
tim tat ca cac so nguyen to p va q sao cho : 7p+q va pq+11 cung la so nguyen to