81=34 suy ra 81 co 5 uoc
250=2.53 suy ra 250 co 8 uoc
126=2.32.7 suy ra 126 co 12 uoc
to suy ra nhu the vi co cong thuc :
*cach xac dinh so luong uoc cua 1 so :
a=xm.yn.zt(x;y;z la so nguyen to)tuc la a duoc phan h ra thua so nguyen to
suy ra U(a)co(m+1).(n+1).(t+1)........uoc.
nho k cho mk nha!