a ) so tren co the phan h thanh dang a ^ x.b ^y.c^.z ( phan h ra thua so nguyen to )
So uoc cua no se la : ( x + 1 )( y + 1 )( z + 1 ) .........= 8
Ma 8 = 2 x 2 x 2 = ( 1 + 1) + ( 1+ 1 ) + ( 1 + 1 )
So do se la : a. b . c
De nho nhat la a,b,c so nguyen to nho nhat ( c > b > a < 1 )
suy ra a = 2 , b = 3 , c= 5
Vay so do la : 2. 3 . 5 = 30
chuc ban hoc gioi