7x7x7x7x7x7x7x7 = 78=5764801
K nha, mk nhanh nhất
7x 7 x 7 x 7 x 7 x 7 x 7 x 7 = 5764801
3678;3687;3786;3876
444 nha bn
=5764801
3678 ; 3687 ; 3786 ; 3876
=1890 nha bn
\(7x7x7x7x7x7x7x7=5764801\)