cho mot so co ba chu so ma chu so hang tram la 4.neu xoa bo chu so 4 nay di,ta duoc mot so co hai chu so.biet tong cua so co ba chu soda cho vaso co hai chu soco duoc sau khi xoa chu so 4la 450.tim so co ba chu so da cho ban dau.

cho mot so co ba chu so ma chu so hang tram la 4. neu xoa bo chu so 4 nay di, ta duoc 1 so co hai chu so. Biet tong cu so co ba tru so da cho va so co hai chu so co duoc sau khi xao chu so 4 la 450. Tim ba chu so da cho ban dau

Tim 1 so co 3 chu so biết chu so hang chuc bang tong chu so hang tram voi chu so hang don vi. Chia chu so hang   tram cho chu so hang dọn vi ta được thương la 3 va du 1. Tich cua so tan cung voi 7 la mot so co chu so tan cung ben phai la 4

Cho 2 so lon hon 320 co tong=836 chu so hang tram cua so thu1 la 5 chu so hang tram cua so thu 2 la 3 neu gach bo chu so 5 va 3 thi se duoc 2 so co 2 chu so ma so nay gap 2 lan so kia tim hieu hai so do

Tim so co 4 chu so biet so do cong voi so co 2 chu so tao boi chu so hang nghìn ,tram va so co 2 chu so tao boi chu so hang chuc ,don vi cua so do tong la 7968

Tim mot so co ba chu so biet hieu giua chu so hang

tram va chu so hang don vi la so lon nhat co ba chu so,

 chu so hang chuc kem chu so hang tram la 4.

tim so co 3 chu so biet tong 3 so la 21 tong ba chu so gap ba lan hang tram chu so hang chuc hon chu so hang don vi 4. So can tim la violympic

tong cac chu so cua 1 so co 3 chu so la 21 chu so hang don vi lon hon chu so hang chuc .neu ta doi vi tri chu so hang don vi va chu so hang tram thi duoc mot so moi co gia tri lon hon so cu la 198. tim so cu .

giup mk nhe

tong cua mot so co 3 chu so va 1 so co 2 chu so la mot chu so co 4 chu so. biet hai so hang va tong khong thay doi gia tri khi ta doc so do tu trai qua phai hoac tu phai qua trai. tim so co 3 chu so tren !