5x . 5x+1 . 5x+2 = 100...0 ( 18 c/s 0 ) : 218
5x . 5x . 51 . 5x . 52 = 518
(5x)3 . 53 = 518
5x.3 = 518-3
5x.3 = 515
x . 3 = 15
x = 15 : 3
x = 5
Đúng 0
Bình luận (0)