hay viet them vao cac day so sau day sao cho moi day co du 10 so hang

a. 1, 3,5,7,

b. 0,3,4,7,11,

tim mot so co hai chu so biet rang neu viet them chu so 0 xen vao giua chu so hang chuc va hang don vi cua so do ta duoc so moi va neu viet them chu so hai vao ben trai so moi thi ta duoc mot so gap 6 lan so moi do

Viet tiep 3 so hang vao moi day so sau

a, 2,7,22,67,...,...,...

b,1,2,3,6,12,...,...,...

tim mot so co hai chu so , biet rang neu ta viet them chu so 0 vao giua chu so hang chuc va chu so hang don vi cua so da ta duoc so moi gap 7 lan so ban dau.

ai lam dung day du nhanh nhat minh tick cho nha 

tim so tu nhien co 2 chu so neu viet them chu so 0 xen giua chu so hang chuc va hang don vi cua so do ta duoc so moi gap 10 lan so can tim . neu viet them chu so 1 vao ben trai so vua nhan duoc thi so do gap len 3 lan . so can tim 

tim so tu nhien co 2 chu so ,biet rang neu viet them chu so 0 xen giua chu so hang chuc va hang don vi cua so do ta duoc so moi gap 10 lan so can tim .Neu viet them chu so 1 vao ben trai so vua nhan duoc thi so do gap len 3 lan.

viet them ba so hang vao day 5,7,12,19,31,50

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

tim mot so co 6 chu so biet rang neu viet them chu so 0 vao giua hang nghin va hang tram thi duoc so moi gap 9 lan so can tim