hai so co tong bang 78.Neu giu nguyen so hang thu nhat va them vao so hang thu hai14 don vi thi tong moi bang bao nhieu?

tong cua ba so bang 20,09 neu so hang thu nhat tang them 1,01 so hang thu hai tang them 2,09 va so hang thu ba tang them 3 don vi thi duoc tong moi la bao nhieu

trong mot phep cong co tong bang mot so hang thi so hang kia la:1,0,10

tim 1 phep cong 2 phan so thap phan biet rang neu so hang thu nhat them 2.001 don vi tong la 223.221 con tang so hang thu hai len 2 lan thi tong la 241.32

tim so chia cua mot phep chia , biet rang : so bi chia 410, so du bang 19

a) tim mot so co hai chu so va neu lay so do chia cho chu so hang don vi thi duoc thuong la 8 va du 7

b) tong cua hai so bang 196 . tim hai so do

c)tim so co 3 chu so , biet rang neu viet them mot chu so 3 vao ben phai so do thi no tang them 2217 don vi 

tim tong cua 2 so biet rang neu viet them vao so hang thu 1 3285 don vi va giu nguyen so hang thu 2 thi ta duoc tong moi la 45678

trong 1 phep cong gom 2 so hang, biet rang neu tang so hang thu nhat them 234 thi tong se bang 579. hoi neu gian so hang thu 2 di 234 thi tong se bang bao nhieu

tong cua hai so bang 2000. Neu so hang thu nhat them 135 don vi va so hang thu hai bot 531 don vi thi duoc tong moi la bao nhieu ?