Cho a la so co 2 chu so tim a biet rang tong 2 chu so cua a cong them binh phuong cua tong 2 chu so do se duoc a.

hai so thap phan co hieu la 10,2nen tim duoc tong la 28,74.em hay tim .khi cong hai so do voi nhau,ban BINH da dich nham dau phay cua so lon sang ben trai mot chu so nen tim duoc tong la 28,74. em hay tim tong dung cua hai so do?

ban an phai tim tat ca cac so co 3 chu so lon hon 500 ma tong cac chu so cua moi so do deu bang 12 dong thoi chu so hang don vi bang trung binh cong cua chu so hang tram va hyang chuc hoi ban an tim duoc nhieu nhat bao nhieu so thoa man yeu cau

tim so tu nhien co hai chu so thoa man ba dieu kien sau.tong cac chu so cua no khong nho hon 7 tong binh phuong cac chu so khong lon hon 30.hai lan so duoc viet boi cac chu so cua so phai tim theo thu tu nguoc lai khong lon hon so do

cho mot so co ba chu so ma chu so hang tram la 4.neu xoa bo chu so 4 nay di,ta duoc mot so co hai chu so.biet tong cua so co ba chu soda cho vaso co hai chu soco duoc sau khi xoa chu so 4la 450.tim so co ba chu so da cho ban dau.

tim so tu nhien lon nhat biet khi binh phuong so do ta duoc mot so co 3 chu so va neu gap 8 lan so co 3 chu so do ta duoc mot so cung co 3 chu so

tim so co 2 chu so biet 3 lan so do  bang binh phuong 1 tong cac chu so cua so do va bang 4 lan tong cac chu so  do

tong cua cac chu so co 3 chu so duoc tao thanh tu cac chu so 1;2;3;4 la: