1.tong cua ba so la 615.biet so thu hai hon so thu nhat 30 don vi nhung lai kem so thu ba 15 don vi.

  Vay so thu nhat la:

2.Tong cua hai so la 222. biet rang neu cung them vao moi 9 don vi thi so lon se gap doi so be. So lon la:

3.{2012nhan 99-1006nhan 18} nhan 2013=

hieu hai so la 12 neu chia so be cho 7 va so lon cho 5 thi thuong thu nhat lon hon thuong thu 2 la 4 don vi tim hai so do

tong cua hai so la 30,3 biet so lon hon do be 8,5 don vi hoi cung bot o moi so bap nhieu don vi de so lon gap 3 lan so be

Tong cua ba so tu nhien la 1993. So thu nhat lon hon tong cua hai so Kia la 57. Neu not o so thu hai 36 don vi thi so thu hai bang so thu ba . Tim moi so da cho ? 

Tong cua ba so la so lon nhat co ba chu so. Neu lay so thu nhat chia cho so thu hai thi duoc thuong la 5, du 3. So thu nhat hon tong cua hai so kia la 7 don vi. So thu nhat hon so thu hai la ?

tim tat ca cac so tu nhien có 2 chu so biet rang chu so hang don vi nho hon chu so hang chuc la 2 va tich cua chu so do cua no luon lon hon tong cua hai chu so cua nó la 34 don vi

hieu hai so nho hon so bi tru la 56 don vi so tru lon hon hieu la 8 don vi hoi so bi tru bang bao nhieu don vi

hieu hai so la 1985  lay so lon chia cho 10 so be chia cho 5 thi thuong thu nhat hon thuong thu hai 17 don vi tim hai so do

trong mot phep cong tong lon hon so hang thu nhat 28764 don vi va so hang thu hai gap ba lan so hang thu nhat vay so hang thu nhat la.........