Bach do Chien:
"do ban tim duoc so tron chuc lon hon 40.000 co cac chu so khac nhau ma tong cac chu so cua so do bang 10.Khi cong so do voi so viet theo thu tu nguoc lai thi duoc mot so co 5 chu so giong nhau.
Chien thach thuc:
-Neu tim duoc so do thi sao?
-Thi to cho cau di an kem tha cua chu sao.
nham mot lat,roi viet ngay hai so do ra giay.Chien than phuc roi dua ban di an kem.
cac ban cung thu suc nhe
1 tong cac chu so cua 1 so co 2 chu so la 9 neu doi cho 2 chu so cho nhau ta duoc mot so kem so ban dau 97 don vi tim so do
ai lam nhanh nhat va dung nhat minh tick cho
tong cua hai so bang 440 neu viet them chu so 4 vao ben trai so be thi duoc so lon. tim hai so do biet so be la mot so co 2 chu so.
tong cua hai so bang 440 neu viet them chu so 4 vao ben trai so be thi duoc so lon. tim hai so do biet so be la mot so co 2 chu so.
tong cua hai so bang bon trambon muoi sau neu viet them chu so 4 vao ben trai so be thi duoc so lon. tim hai so do biet so be la mot so co 2 chu so.
Tim mot so co 4 chu so biet rang neu xoa di chu so 5 o ben trai so do thi duoc so moi.Tong cua so moi va so ban dau la 6738
tim mot so co hai chu so biet rang neu lay so do cong voi 35 roi cong tiep 65 thi duoc mot so moi co tong cac chu so la18.
biet bai nao giai ho bai y
1tim mot so co 2 chu so biet rang so do gap 5 lan tong chu cac so cua no
tim so co 3 chu chu so biet rang them chu so 5 vao ben phai so do thi so do tang them 1112dv
tim mot so tu nhien co 2 chu so biet rang them chu so 9 vao ben trai so do thi duoc mot so gap 13 lan so da cho
TIM MOT SO CO 2 CHU SO , BIET RANG NEU SO DO CONG VOI 35 ROI CONG TIEP VOI 65 THI DUOC MOT SO MOI CO TONG CAC CHU SO BANG 18