Các câu hỏi tương tự
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
neu a la so gam 200 chu so 1 va B la so gom 100 chu so 2 CMR A-B la so chinh phuong
chung minh rang neu A la so gom 200 chu so 1 va 100 chu so 2 thi A-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 gom 4 chu so biet so gom 2 chu so dau lon hon so gom 2 chu so sau 1 don vi
cho cac so tu nhien n va 2n co tong cac chu so bang nhau
a) chung minh n chia het cho 9
b)tim so chinh phuong n co 3 chu so biet n chia het cho5 va 2n thi tong cac chu so khong doi
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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 CHINH PHUONG CO HAI CHU SO SAO CHO NEU CONG SO DO VOI SO GOM HAI CHU SO AY THEO THU TU NGUOC LAI THI TA DUOC MOT SO CHINH PHUONG