tong cua tat ca cac so co 2 chu so ma chu so hang don vi bang 5 la .......

Tim so co 2 chu so ma tong hai chu so cua so do bang 14 va neu doi vi tri. Hai chu so cua so do thi so do giam di 18 don vi 

Cho so chan co 4 chu so ma tong cac chu so cua no bang 24 . Neu viet so do theo thu tu nguoc lai thi van duoc so da cho . Hay tim so da cho , biet rang nhom 2 chu so ben trai lon hon nhom 2 chu so ben phai la  36 don vi .

so co hai chu so ma tong cac chu so bang 12 va hieu giua so hang chuc va hang don vi bang hai la bao nhieu ?

tim so tu nhien co 4 chu so khac nhau lon hon 3142 ma co tong cac chu so bang 6 va chu so hang chuc be hon chu so hang don vi

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

viet so lon nhat co bon chu so ma tong cac chu so bang 9 ,hieu chu  so hang don vi  va hang don  vi va hang nghin la 5

Cau 1 co tat ca ..... so co 2 chu so ma hieu 2 chu so cua moi so do bang 6

Cau 2 so lon nhat co 2 chu so ma hieu 2 chu so cua moi so do bang 5 . La :.............

Cau 3 so be nhat co 2 chu so ma tong 2 chu so cua moi so do bang 9 . La : .............

tim cac so co 2 chu so ma chu so hang don vi la so chan nho nhat co 1 chu so (Toan lop 2)