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chung minh rang neu A la so gom 200 chu so 1 va 100 chu so 2 thi A-B la so chinh phuong
CMR neu A=111...1(200 chu so 1) va B=222...2 (100 chu so 2) thi A-B la mot so chinh phuong
cho so tu nhien a gom 100 chu so va 1 so tu nhien b gom 50 chu so 2 chung minh ava b la hai so chinh phuong
Cho so A gom 2n chu so 1
B gom n chu so 2
Co hay khong A va B la so chinh phuong
Cho so tu nhien A gom 4030 chu so 1 , so tu nhien B gom 2015 chu so 2 . Chung minh rang A-B la mot so chinh phuong
cac ban giai ra nhe
tim so co 3 chu so sao cho hieu cua so ay va so gom 3 chu so ay viet theo chieu nguoc lai la mot so chinh phuong
Tim so chinh phuong co 10 chu so neu chia so do cho tong 10 chu so thi duoc thuong la 45509825 va du 14
chung to
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a, so co tong cac chu so la 2004 khong la so chinh phuong
b, so co tong cac chu so la 2006 khong la so chinh phuong
c, n = 20044+20043+20042+23 khong la so chinh phuong
tim so tu nhien lon hon 0 sao cho tong
1!+2!+...+n! la so chinh phuong
b)tim 1 so co 4 chu so sao cho so do vua la s chinh phuong vua la so lap phuong