Chi oi, tai sao:
5.2n.[(2^k) -1] = 1240
5.(2^k).2n = 1280
Em ko hieu? Giai thich dum nha.
(http://www.sinhhocvietnam.com/forum/showthread.php?p=68689#post68689)
5.2n.[(2^k) -1] = 1240
5.(2^k).2n = 1280
Em ko hieu? Giai thich dum nha.
(http://www.sinhhocvietnam.com/forum/showthread.php?p=68689#post68689)