tim 2so co tong la so lon nhat co 1 chu so va hieu cua chung bang 5
Tim cac so co 2 chu so ma tong cac so la 13, tich la 36.
tim so bi tru, biet hieu la 45 va so tru la so nho nhat co hai chu so giong nhau
em hay tim so co ba chu so ma hieu cua chu so hang tram va chu so hang chuc la 0 con hieu cua chu so hang chuc va chu so hang don vi bang 9
tim cac so co 2 chu so biet tong 2 so la 11 tich la 30 tim 2 so do
trong mot phep tru ta co hieu so la 54.neu giu nguyen so bi tru va them vao so tru 5don vi thi hieu so moi la bao nhieu
tim 2chu so co1 chu so ma tong 2so la so be nhat co 2chu so hieu 2chu so la 8
tong cua 2 chu so la so be nhat co 2 chu so ma hieu 2 chu so do bang 7 . so hang thu 2 la 9. tim so hang thu 1
tim so co 2 chu so biet tong hai chu so la 13 va hang chuc lon hon hang don vi la
5