cac so co 1 chu so la 1;2;3;.....;9
tung binh con cac so co 1 chu so la :
(1+2+3+4+5+6+7+8+9):9=5
trung binh cong cac so co 1 chu so la
(0+1+2+3+4+5+6+7+8+9):10=4,5
tinh trung binh cong tat ca cac so chan co 2 chu so. hoi trung binh cong co tat ca cac so chan co 2 chu so la
tim 3 so khac 0 biet rang 3 so do co 1 chu so 1 so co 2 chu so va mot so co 1 chu so va trung binh cong cua chung bang 37
Trung binh cong cua 2 so la so lon nhat co 4 chu so khac nhau . So lon hon trung binh cong la 3810 don vi .tim so be ?
tinh trung binh cong cua so lon nhat co ba chu so khac nhau va so le be nhat co ba chu so
Bài 1:cho day so 1;3;5;7;......;x( gom 10 chu so)
a) tim tong cua day so
b) tim trung binh cong cua day so
Bài 2: co ba ban choi tem. an co so tem bang trung binh cong cua ca ba ban. so tem cua hung nhieu hon trung binh cong so tem cua ca ba ban la 6 con tem. phong co 18 con tem. hoi an va hung moi ban co bao nhieu con tem?
trung binh cong cua cac so le co 1 chu so la
trung binh cong cua ba sola so lon nhat co hai chu so tim moi so do biet so thu nhat bang mot phan nam so thu hai so thu ba bang trung binh cong hai so dau
Tim trung binh cong cac so chan co 3 chu so
Trung binh cong cua hai so la so tron tram lon nhat co 4 chu so,so lonla so lon nhat co 4 chu so.Tim so be
