a 5+5 2+5 3+5 4=50 là hợp số vì nó chia hết cho 2
B 2007 2+2010 4 = 12054 là hơp số vì nó chia hết cho 2
Đúng 0
Bình luận (0)
Các câu hỏi tương tự
Xet xem tong , hieu sau la so nguyen to hay hop so
3.5.7+2011.2013
10^3-8
xet xem tong, hieu sau day la so nguyen to hay hop so
A=1.3.7.13-13
B=2.5.7+4.13
khong thuc hien phep tinh , cho biet cac tong hoac hieu sau day la nguyen to hay hop so
32+3.17+3.433; 7+72+73+74+75 ; 46-30+2002 ; 3.4.5.6.7+7.8.9.10
tong ,hieu sau la so nguyen to hay hop so
A=45+36+72+81
B=4.19-5.4
C=7+72+7+.....+75
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 sau la so nguyen to hay hop so :
a) 2 . 3 .5 + 9 . 31
b ) 5 . 6 . 7 + 9 .10 . 11
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
tong hieu sau la so nguyen to hay hop so
23.27.29+1
Ban nao dung minh se tich
Bai 1Tim nguyen to a de 4a+11 la so nguyen to nho hon 30
Bai 2 cac so sau la so nguyen to hay so hop so:
a=1*3*5*7*....*13+20
b=147*247*347-13