Ta có: 24=23.3
40=23.5
168=23.3.7
a,\(\Rightarrow\)BCNN(24,40,168)=23.3.5.7=840
BC(840)={840, 1680, 2520, 3360, 42000,5040, 5880, 6720, 7560, 84000,9240, 10080, 10920, 11760, 12600,...}
4 số chia hết cho 9 là: 2520, 5040, 10080, 12600
Ta có: 24=23.3
40=23.5
168=23.3.7
BC(840)={840, 1680, 2520, 3360, 42000,5040, 5880, 6720, 7560, 84000,9240, 10080, 10920, 11760, 12600,...}
4 số chia hết cho 9 là: 2520, 5040, 10080, 12600