1) KO BIẾT
2)111=3.37
1111=11.101
11111=41.271
111111=3.7.11.13.37
1111111=239.(4649) LIK NHA
1) KO BIẾT
2)111=3.37
1111=11.101
11111=41.271
111111=3.7.11.13.37
1111111=239.(4649) LIK NHA
a, phan tich so 111 ra thua so nguyen to roi tim tap hop cac uoc cua 111.
b, thay dau * boi chu so thich hop:
** . * =111
133
a.phan tich so 111 ra thua so nguyen to roi tim tap hop cac uoc cua 111
b.thay dau * boi chu so thich hop:
**.*=111
so tu nhien nho nhat sao cho 111...1(nso 1) chia het cho 33..3(100chu so3) la?
Phan tich 11 111 ra thua so nguyen to
tim n nho nhat để số co dạng 111.....11, (n so 1) chia hết cho 27?
Chung to cac so sau la hop so :
26.6101+1
2001.2002.2003.2004.2005-10
10100-7
111...111 (co 2007 chu so 1)
tim 1 so tu nhien n co 4 chu so sao cho n chia cho 118 du 9 va n chia cho 119 du 111
chung minh rang so111...12111...1tat ca co50 chu so1 .khong phai la so nguyen to.
CMR so 111...11-n chia het cho 9 ( co n so 1)