cho day so:36,45,54

a) viet them 3 so hang thich hop vao day so tren

b) so hang thu 20 thuoc day so nao

c) so 3469 co thuoc day so tren khong?vi sao

giai chi tiet giup minh nhe

Cho day so : 45;54;63;....

a/ So hang thu 214 cua day tren la so nao ?

b/ So 2016 co thuoc day so tren ko? vi sao?

cho day so 1;8;15;.......;694;701.

a,tinh tong cua cac so trong day tren.

b,so thu 51 cua day so la so bao nhieu?

c,so 1240 co thuoc day so tren khong?vi sao?

cac ban giai ca bai giup minh nhe,cam on nhieu...

cho hai day so :

1 , 4, 7 , 10 , 13 , ....

1/2 , 2/3 , 3/5 , 5/8 , 8/13 ,.....

a, hay neu quy luat va viet hai so hang tiep theo cua moi day so tren .

b, so 2005 co phai la so hang cua day so 1,4,7,10,13 ... khong ? vi sao ? 

cho day so 12;15;17;18........1945.Hoi:

a,Day so tren coi bao nhieu so hang?

b,So hang thu 300 la so nao?

cho day so 1004,1010 1016,....,2012.hoi so 2018va 1760 co thuoc day so tren khong

giup to voi 

hien nay gia dinh an co 3 nguoi  ..tong so tuoi cua 3 nguoi la 66 tuoi .cach day 4 nam tong so tuoi cua 3 nguoi la 55 tuoi.tinh so tuoi moi nguoi biet bo hon me 3 tuoi

Tim quy luat va dien 3 so thich hop vao trong day so

1,2,2,4,8,....,......,.....

Moi nguoi giup mk voi nhe! Cam on moi nguoi ^-^!

Cho day so:5,21,53,101,165.....

A.So 23765 la so hang thu may cua day ?

B.So hang thu 87cua day la so nao ?