Ta có: 6Ab - AB * 41 = 0
=> 6ab = ab x 41
=> 600 + ab = ab x 41
=> 40 x ab = 600
=< ab = 600 : 40
=> ab = 15
Ta có: 6Ab - AB * 41 = 0
=> 6ab = ab x 41
=> 600 + ab = ab x 41
=> 40 x ab = 600
=< ab = 600 : 40
=> ab = 15
Ta có: 6Ab - AB * 41 = 0
=> 6ab = ab x 41
=> 600 + ab = ab x 41
=> 40 x ab = 600
=< ab = 600 : 40
=> ab = 15