Số 5 chữ số là: ABCDE, là số lẻ, tổng A + B + C + D + E =16
Số phải bé nhất => A = 1, E = 9
=> B + C + D = 16 - 1 - 9 = 6; B, C, D khác nhau và khác 1, 9
Muốn số bé nhất => B = 0; C = 2; D = 4
Vậy số cần tìm là: 10249
Viet so tu nhien nho nhat co cac chu so khac nhau ma tong cac chu so la 9
cau 1 ;2 so co tong la 346 biet so be la so co hai chu so va khi viet them chu so 3 vao truoc so be thi duoc so lon tim so be
cau 2 ; tong 2 so la 390 so be l¸o co 2 chu so va neu viet them chu so 3 vao truoc so be thi duoc so lon tim so lon
cau3;chu vi 1 khu dat hinh chu nhat =68 chieu dai hon chieu rong16m nguoi ta trong rau tren khu dat do TB cu 2m vuong trong duoc 2 kg rau tinh so rau o khu dat do
cau4 ; TBCcua 2 so la so nho nhat co 3chu so khac nhau biet so lon lon hon TBCcua 2so la 24 don vi tim so be va so lon
tinh hieu cua so lon nhat co 6 chu so khac nhau va be nhat co 6 chu khac nhau
viet so be nhat co 6 chu so hang nghin la 8 chu so hang chuc la 5
tong cua 2 so la 432 . so lon nhat co 5 chu so ma chu so hang cao nhat la 1. neu xoa bo chu so 1 do thi duoc so be . tim 2 so do
Tong cua hai so la so le be nhat co 4 chu so hieu hai so la so lon nhat co3 chu so khac nhau .Tim so lon
1) Mot hinh chu nhat co chu vi la 320 cm . Biet neu viet them chu so 1 vao ben trai so do chieu rong thi duoc so do chieu dai . Tim dien tich cua hinh chu nhat ?
2) Viet cac phan so sau day thanh tong 3 phan so sao cho moi phan so co tu so la 1 , mau so khac nhau
a) 11/26 ; b) 7/8
tinh tong cua :so lon nhat va so be nhat co 4 chu so khac nhau .
so le lon nhat va so chan so be nhat co 4 chu so co tong cac chu so bang 4.
tong cua 2 so la 16432 so lon la so co 5 chu so ma chu so hang cao nhat la 1 neu xoa bo chu so 1 do thi ta duoc so be tim 2 so
tong 2 so la so lon nhat co 5 chu so .Hieu 2 so la so le be nhat co 3 chu so .Tim 2 so do
