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 so 11591. Hoi day la so nguyen to hay hop so ? vi sao
tong[hieu sau la so nguyen to hay hop so?
a,5.6.7+8.9
b,5.7.11+13.17.19
c,5.7.9.11-2.3.7
d,4253+1422
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?
Các so sau la hop so hay so Nguyen to ?vi sao. a a=1.2.3.....n. b n=n.a+1
1.Tong (hieu) sau la so nguyen to hay hop soa/5.6.7+8.9 b/5.7.9.11-2.3.7 c/5.7.11+13.17.19 d/4253+14222.Hai so nguyen to sinh doi la hai so nguyen to hon kem nhau 2 don vi.Tim hai si nguyen to sinh doi nho hon 50.3.Cho biet:Neu do tu nhien a(lon hon 1)khong chia het cho moi so nguyen to p ma binh phuong ko vuot qua a(tuc la p2 lon hon hoac bang aĐ thi a la so nguyen to.Dung nhan xet tren cho biet so nao trong...
Đọc tiếp
1.Tong (hieu) sau la so nguyen to hay hop so
a/5.6.7+8.9 b/5.7.9.11-2.3.7 c/5.7.11+13.17.19 d/4253+1422
2.Hai so nguyen to sinh doi la hai so nguyen to hon kem nhau 2 don vi.Tim hai si nguyen to sinh doi nho hon 50.
3.Cho biet:Neu do tu nhien a(lon hon 1)khong chia het cho moi so nguyen to p ma binh phuong ko vuot qua a(tuc la p2 lon hon hoac bang aĐ thi a la so nguyen to.Dung nhan xet tren cho biet so nao trong cac so 59;121;179;197;217 la so nguyen to?
4.a/So 2009 co la boi cua 41 ko?
b/Tu 2000 den 2020 chi co 3 so nguyen to la 2003;2011;2017.Hay giai thich tai sao cac so le khac trong khoang tu 2000 den 2020 deu la hop so.
5.Goi a=2 . 3 . 4 . 5 . .... . 101. Co phai 100 so tu nhien lien tiep sau deu la hop so ko?
a+2,a+3,a+4,...,a+101.
ai dung kik cho,giup mk nha,ai biet lam bai nao thi lam cung dc,lm het cang tot
tong cua 2 so nguyen to lon hon 2 la so nguyen to hay hop so ? Tai sao ?
cho so nguyen to p va mot trong hai s 8p+1 va 8p-1 la so nguyen to ,so con lai la so nguyen to hay hop so?