Các câu hỏi tương tự
Cho p la so nguyen to (p<3) va 2p+1 cung la so nguyen to . Hoi 4p+1 la so nguyen to hay hop so?Vi sao?
Cho A=7.9.11 - 2.3.7 la so nguyen to hay hop so. vi sao
a, tim n de n^2 + 2006 la mot so chinh phuong
b, Cho n la so nguyen to lon hon 3. Hoi n^2 + 2006 la so nguyen to hay hop so.
So 274 la hop so hay so nguyen to ? Vi sao?
Cho A= 2. 4. 6. 8. 10 + 18
a) A co chia het cho 2, cho 3, cho 9 ko? vi sao?
b) A la hop so hay so nguyen to? vi sao?
c) Aco phai la so chinh phuong ko? vi sao?
Cho so 11591. Hoi day la so nguyen to hay hop so ? vi sao
tong sau day la so nguyen to hay hop so: 3.5.7 + (2n+1).(2n+3).(2n+5) voi n la so tu nhien
cac so sau la so nguyen to hay hop so:
a)a=1.3.5.7.13+20
b)b=147.247.347-1
cho n la so nguyen to lon hon 3.hoi n2 +2006 la so nguyen hay hop so?