KHI VIET CHU SO 5 VAO BEN TRAI MOT SO CO BON CHU SO THI DUOC SO MOI HON SO CU.......DON VI ?

khi viet them chu so 2 vao ben trai 1so co 3 chu so thi duoc so moi hon so cu la bao nhieu don vi 

khi viet them chu so 7 vao ben trai cua so co 3 chu so thi so moi hon so cu bao nhieu don vi

cho so co 6 chu so.Neu viet them chu so 6 vao ben trai so da cho thi duoc so moi hon so cu bao nhieu don vi

khi viet chu so 5 vao ben tay trai cua mot so 4 chu so thi so moi hon so cu bao nhieu don vi ?

Mik kog bit lam the nao
Dap an : 5000 sai

khi viet them chu so 2 vao ben trai so co 3 chu so thi duoc so moi hon so do luc dau 20 don vi

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

tim mot so biet rang khi viet them chu so 6 vao ben phai so do ta duoc so moi hon so cu la 2562 don vi

tim so co bon chu so bietrang khi viet viet them chu so 5 vao ben phai so do thi duoc so moi hon so phai tim 18113 don vi