Tim mot so co ba chu so biet trung binh cong cua ba so do bang 2va chu so hang tram bang tong cac chu so hang chuc va hang don vi

tim 3 so tu nhien lien tiep trong do so nho la chan va mot trong 3 so do co mot so chia het cho 9, biet tong 3 so do la mot so co 3 chu so co cac dac diem sau: chia het cho 5,tong chu so hang tram va hang don vichia het cho9, chu so hang chuc la chan

TIM SO CO BA CHU SO BIET TRUNG BINH CONG 3 SO DO BANG 3 ,CHU SO HANG DON VI GAP DOI TONG CAC CHU SO HANG TRAM VA HANG CHUC

tim so co 3 chu so biet chu so hang tram nho hon chu so hang chuc,chu so hang chuc nho hon chu so hang don vi va tong cac chu so do bang 6

tim so co 4 chu so chia het cho 2,3 va 5 biet rang khi doi cho cac chu so hang don vi voi hang tram hoac hang chuc voi hang nghin thi so do khong thay doi

mot so gom 3 chu so co tong cac chu so bang 26.tim so do biet rang khi doi cho chu so hang tram va hang don vi cho nhau thi so do khong doi 

tim so co ba chu so biet rang neu doi chu so hang tram va don vi cua no cho nhau thi gia tri cua no khong thay doi con chu so hang chuc bang mot phan ba tong hai chu so kia

tim mot so biet so do nho hon 800 va chu so hang tram nho hon chu so hang chuc , chu so hang chuc nho hon chu so hang don vi va tong cac so cua chu so cua so do bang 24

Bai 1:Cho so tu nhien A co 4 chu so. Co chu so hang don vi gap 3 lan chu so hang tram chu so hang chuc gap 8 lan chu so hang nghin. Biet A chia het cho 9.Tim A

Bai 2: Tim tat ca cac so dang 6x14y. Biet rang so do chia het cho 3,4 va 5